C. pachydermum Lund. var. aethiopicum West et West    Pl. 20: 11
  Krieger & Gerloff, 1962, p.13, pl.5:3.  
 
C. pankakoskii Grönbl.     Pl. 20: 4,5
  Krieger & Gerloff, 1962, p.38, pl.11:5.  
 
C. perforatum Lund.    Pl. 20: 12,13
  Krieger & Gerloff, 1962, p.31, pl.9:7  
  Variable species (cf. Förster, 1982, Kouwets, 1987).  
 
C. phaseolus Bréb. in Ralfs var. elevatum Nordst.      Pl. 22: 4,5
  Krieger & Gerloff, 1962, p.54, pl.14:4.  
 
C. phaseolus var. minus (Boldt) Krieger       
  West & West, 1905, p.154, pl.60: 15.  
 
C. pitense Schmidle    Pl. 28: 7,8
  Krieger & Gerloff, 1969, p.277, pl.45:19.  
 
C. platyisthmum Arch.  Pl. 17: 8-11
  Archer, 1883.     Pl. 17: 12,13 (zyg.)
  Coesel & Delfos (1986) described this species as C. taxillus but  later discovered that they overlooked the description of Archer (l.c.).  cf. West & West, 1908, p.127.
 
C. pokornyanum (Grun.) West et West        Pl. 26: 6,7
  Krieger & Gerloff, 1965, p.174, pl.36:3.  
 
C. pokornyanum var. skujae Krieger & Gerloff     Pl. 26: 8,9
  Krieger & Gerloff, 1965, p.176, pl.36:4.  
 
C. pokornyanum var. groenbladii Förster      Pl. 26: 10
  Förster, 1963, p.50, pl.1:18.  
 
C. portianum Arch.    Pl. 31: 1
  West & West, 1908, p.165, pl.80:4-7.  
 
C. portianum var. nephroideum Wittr.  Pl. 31: 2
  West & West, 1908, p.167, pl.80:10-11.  
 
C. praegrande Lund.  Pl. 31: 4
  West & West, 1908, p.150, pl.77:19.  
 
C. praemorsum Bréb. var. quadripunctatum Insam et Krieger  Pl. 34: 24-26
   Insam & Krieger, 1936.  
   cf. Scharf, 1981.  
 
C. pseudoarctoum Nordst.   Pl. 16: 30
   West et West, 1908, p.32, pl.68: 12-14,  
 
C. pseudoexiguum Rac. var. retusum Hirano      Pl. 28: 1,2
  Krieger & Gerloff, 1969, p.274, pl.45:115  
 
C. pseudonitidulum Nordst. var. validum West et West    
  Krieger & Gerloff, 1965, p.168, pl.34:10.  
 
C. pseudoprotuberans Kirchn. var. kosinskajae     Pl. 28: 44-46
  Krieger & Gerloff, 1965  
 
C. pseudopyramidatum Lund.   Pl. 18: 5-8
  Krieger & Gerloff, 1965, p.124, pl.26:1.  
 
C. pseodoretusum Duc. var. inaequiellipticum (West et West) Krieger & Gerloff .
  Krieger & Gerloff, 1962, p.97, pl.20:20.   Pl. 25: 24
 
C. punctulatum Bréb. var. subpunctulatum (Nordst) Börges.    Pl. 35: 8-10
  West & West, 1908, p.209, pl.84:15-20  
 
C. pygmaeum Arch.   
  Krieger & Gerloff, 1965  
 
C. pygmaeum var. apertum    Pl. 29: 3,4
  Krieger & Gerloff, 1965 ?  
 
C. pygmaeum var. atumidum Grönbl.   Pl. 28: 29
  Krieger & Gerloff, 1965, p.223, pl.40:24.  
 
C. pygmaeum var. perornatum Skuja     Pl. 28: 26-28
  Krieger & Gerloff, 1965, p.223, pl.40:26.  
 
C. pyramidatum Bréb.  Pl. 18: 1-4
  Krieger & Gerloff, 1965, p.121, pl.25:3.  
 
C. quadratulum (Gay) De Toni  Pl. 28: 21
  W. & G.S. West, 1908, p.121, pl.72: 33  
 
C. quadratum Ralfs     Pl. 17: 2, 3
  Krieger & Gerloff, 1969, p.280, pl.45:27.       ?  
 
C. quadrifarium Lund.  
  West & West, 1908, p.141, pl.76:15-17  
 
C. quadrimammillatum West et West  Pl. 29: 27-33
  West & West, 1908, p.125, pl.93:3.  
  Synonym:  C. pygmaeum Arch. var. quadrimamillatum (West et West) Krieg. &  Gerl.  
  Krieger & Gerloff (1965,  p.224) considered this species to be a variety
  of C. pygmaeum Arch.,  but since some of our specimens showed a clear
  scrobiculation and since C.  pygmaeum is much smaller,  I  follow   the view of West & West.  
 
C. quinarium Lund.    Pl. 35, 11,12
  West & West, 1908, p.216, pl.85:9-10.  
 
C. rectangulare Grun. var. croasdaleae Först.      Pl. 21: 1-55, 23: 4
  Krieger & Gerloff, 1969, p.247, pl.43:6.  
 
C. regnellii Wille var. minimum Eichl. & Gutw.       Pl. 28: 25
  Krieger & Gerloff, 1969, p.246, pl.43:8.  
 
C. regnesii Reinsch    Pl. 28: 30,31
  W. & G.S. West, 1908, p.36, pl.68: 19-28  
 
C. regnesii var. polonicum (Eichl. & Gutw.) Comp.        Pl. 28: 38-43
  Förster, 1982, p.262, pl.26:14-15.  
 
C. reniforme (Ralfs) Arch.  Pl. 33: 8
  West & West, 1908, p.157, pl.79:1-2.  
 
C. reniforme var. apertum West et West     Pl. 33: 9
  West & West, 1908, p.159, pl.79:5. ? Pl. 22: 21, 22
 
C. reniforme var. compressum Nordst.    Pl. 33: 7
  West & West, 1908, p.158, pl.79:3-4.  
 
C. retusiforme (Wille) Gutw. var. incrassatum Gutw.      Pl. 23: 9
  Krieger & Gerloff, 1962, p.95, pl.20:14.  
 
C. sexangulare Lund.   Pl. 23: 4-6
  Krieger & Gerloff, 1965, p.239, pl.42:10.  
  The specimens studied were somewhat larger (44.5-48 x 39.8-43.3 µm) than those described in Krieger & Gerloff. The cell-wall  was rather thick.  
 
? C. sexnotatum Gutw.     Pl. 34: 20
  W. & G.S. West, 1908, p.227, pl.86: 7  
 
C. sexnotatum var. bipunctatum (Wolosz.)Coes.        Pl. 25: 21-23
  Coesel, 1989, p.189, pl.2: 5,6  
 
? C. smolandicum ? Pl. 20: 6
  W. & G.S. West, 1905, p.134.  
 
C. smolandicum var. angustatum    Pl. 20: 2,3
  W. & G.S. West, 1905, p.135  
 
C. speciosissimum Schmidle     Pl. 32: 1-3
  West & West, 1908, p.254, pl.89:14-15.  
 
C. speciosum Lund. var. biforme Nordst.     Pl. 32: 5
  West & West, 1908, p.249, pl.89:4-5.  
 
C. spec. 2     Pl. 33: 4,5
  The  shape agrees quite well with C. reniforme var minor Irénée-Marie  (in Irénée-Marie (1956)) but the dimensions are much smaller . The  granules are too numerous, too regular and too small for C. orthostichum.  
 
C. sphaeroideum W.West    Pl. 33: 10
  West & West, 1908, p.173, pl.82: 2-4.  
 
C. sphagnicolum West et West.  Pl. 28: 32,33,47-49
  Krieger & Gerloff, 1965, p.224, pl.40:28.       Pl. 28: 50 (zyg.)
 
C. sportella Bréb.   Pl. 32: 9, 10
  West & West, 1908, p.185, pl.82:14.  
 
C. subarctoum (Lagerh.) Racib.  Pl. 16: 20-24
  Krieger & Gerloff, 1962, p.69, pl.16:8.  
 
C. subcapitulum W.West var. madagascariense (West et West) Krieg.& Gerl.  Pl. 28: 51,52
  Krieger & Gerloff, 1969, p.248, pl.43:11.      
  The dimensions of our specimens were somewhat smaller  
  (9.2x9.9 µm) than those given by Krieger & Gerloff (l.c.).  
 
C. subcostatum Nordst.  
  West & West, 1908, p.235, pl.87:3-5.  
 
C. subcostatum var. minus (West et West) Först.       Pl. 34: 6-8
  Förster, 1982, p.272, pl. 37:5.  
 
C. subcrenatum Hartzsch    Pl. 35: 1-3
  West & West, 1908, p.228, pl.86:10-14.  
 
C. subcucumis Schmidle    Pl. 18: 10, 11
  Krieger & Gerloff, 1969, p.284, pl.47:1.  ? Pl. 18: 9
 
C. subgranatum (Nordst.) Lütk.  Pl. 25: 1-4
  Krieger & Gerloff, 1965, p.138, pl.29:10.  
  In our material the specimens studied posessed a concave  apex,  thus resembling C.  impressulum Elfv.,  however the 10  undulations  of  each  semicell,  as well  as  the  triangular  shape  discriminated this species obviously.  
 
C. subgranatum var. borgei Krieg. & Gerl.        Pl. 25: 7-10
  Krieger & Gerloff, 1965, p.139, pl.29:11.  
 
C. subspeciosum Nordst. var. validius Nordst.     Pl. 32: 4
   West & West, 1908, p.253, pl.89: 12-13.  
 
C. subtransiens Croasd.     Pl. 25: 22,23
  Ruzicka, 1973, p.215, pl.12:16-17.  
  For  discussion  of this taxon I refer to  Ruzicka  (l.c.)  and  Kouwets(1987,  p.234, pl.12:4-5)). Our material agreed with the  figures of Kouwets (l.c.) in the absence of a central swelling.  
 
C. subtruncatellum Grönbl.  Pl. 28: 34,35
  Krieger & Gerloff, 1962, p.65, pl.15:20.  
  The  dimensions of our specimens were smaller (11.1 x 11.7    µm)  than those indicated by Krieger & Gerloff (l.c.).  
 
C. subtumidum Nordst.     Pl. 21: 6-26
  Krieger & Gerloff, 1965, p.162, pl.33:17.  Very  variable  species,  probably a  collective  species  (cf.  Förster, 1982).  
 
 
 
C. subundulatum Wille    Pl. 27: 9
  West & West, 1905, p.151, pl.59:13-15.  
 
C. tatricum Rac.   Pl. 26: 12-14
  Krieger & Gerloff, 1965, p.181, pl.36:16.  
 
C. tatricum var. groenbladii     Pl. 26: 15-17
  Krieger & Gerloff, 1965.  
 
C. tetrachondrum Lund.     Pl. 29: 21,22
  West & West, 1905, p.175, pl.62:1.  
 
C. tetragonum (Näg) Arch. var. lapponicum       Pl. 27: 3,4
  Krieger & Gerloff, 1965  
 
C. tetragonum var. ornatum Krieger et Gerloff    Pl. 27: 5-8
  Krieger & Gerloff, 1965, p.208, pl.39: 3.  
 
C. tetraophtalmum Bréb. in Ralfs    Pl. 30: 3-7
  West & West, 1908, p.270, pl.95:4-7.      ?  
 
C. tinctum Ralfs  Pl 29: 12-15 Pl. 29: 12-15
  Krieger & Gerloff, 1962, p.66, pl.16: 1  
 
C. tinctum var. intermedium  Nordst.    Pl. 29: 16
  Krieger & Gerloff, 1962, p.67, pl.16: 4  
 
C. tinctum var. retusum    Pl. 29: 17
  Krieger & Gerloff, 1962  
 
C. tinctum var. trigonum   Pl. 29: 18
  Krieger & Gerloff, 1962  
 
C. transitorium (Heimerl) Duc. Pl. 19: 8
  Krieger & Gerloff, 1962, p.20, pl.7:8.  
  The  dimensions  are larger (86.6 x 59.0  µm) than given  by  
  Krieger & Gerloff (l.c.),  but  agree with those given by  
  Prescott  et  al.(1981, p.331).  
 
C. tuddalense Strøm   Pl. 19: 9
  Krieger & Gerloff, 1962, p.17, pl.7:1.  
 
C. tumidum Lund.     Pl. 20: 7-9
  Krieger & Gerloff, 1962, p.57, pl.14:11.  
 
C. tumidum var. minus Krieg.  Pl. 20: 10
  Krieger & Gerloff, 1962, p.58, pl.14:13.  
 
C. turpinii Bréb. var. eximium West et West      Pl. 32: 8
  West & West, 1908, p.192, pl.83:3.  
 
C. tyrolicum (Nordst.) Krieg. & Gerl.  Pl. 27: 10,11
  Krieger & Gerloff, 1962, p.47, pl.12:12.  
 
C. variolatum Lund.    Pl. 24: 18
  Krieger & Gerloff, 1965, p.117, pl.24:12.  
 
C. variolatum var. incrassatum   Pl. 24: 19-21
  Krieger & Gerloff, 1965.  
 
C. venustum (Bréb.) Arch.  Pl. 23: 11-14
  Krieger & Gerloff, 1965, p.198, pl.38:8.