48 p. T. CLEVE, SYNOPSIS OF THE NAVICUI.OID DIATOMS. 



10. 



Striae about 21 in 0,ol mm. . . . ...... . . C. cemula A. S. 



— — 25 — — . . ...;.,.,.,.. . C. fasciata Lagst. 



[ Valve lanceolate ... . . ..... 12. 



11. ■! — constricted ... 14. 



I — bioonstricteil . ... . . . IG. 



j Ends capitate ..... ... . C. Beccariana Geuii. 



1^- -j _ not - . 13. 



..„ ( Valve trochiform . C. bodosensis Pant. 



\ — elliptical-lanceolate . . C. hottnica Cl. 



.. . j Axial area indistinct ..... C. galapagensis Cl. 



1^ — ■ — distinct or rather broad . . 15. 



[ Striae 6 in 0,01 mm C. scintillans Br. a. Temp. 



15. < — 9 — , . . . . . . C. Hardmaniana Cl. 



\ — 16 — . ... C. galapagensis var. japonica. 



j Striae 6 to 11 in 0,oi mm. . 17. 



\ — abont 20 in 0,oi mm. . .... 18. 



j Median segment large . C. ophioeephala Cl. 



\ — — small . . C formicina Geun. 



J Longitudinal lines median . . . C. claviger Cl. 



\ — — indistinct C. cohimbiensis Cl. (C. Schwmaniana var. Herihaudi P:6eag.). 



( Valve constricted . . .20. 



\ — not — . . ... . . . .30. 



j Valve constricted in the middle ... . . SI. 



\ — biconstricted .... .... 25. 



I Striae 7 to 12 in 0,oi mm. ... . . 22. 



\ — about 22 — . N. Liber var. Janischiana. 



I Area indistinct . . . C. Liber var. BleiscMana. 



\ — distinct . ... S3. 



f Central and axial area united in a narrow lanceolate space 24. 



\ Central area quadrate . . . . C. Powellii var. Bartholomei. 



o . ( Longitudinal lines broad . . . . . C. Musca Greg. 



' \ — — narrow C. Kinkeriana. Tehan. 



( Small forms (L. 0,03 to 0,04 mm.) . . 26. 



I Larger — .... . . . . • 27. 



{Ends broad . . C. lobata Schwaktz. 

 — acuminate . . C. egena A. S. 



(Axial area broad .... . . . C. biclavata Cl. a. Grove. 



— narrow . ...... 28. 



f Striae about 8 in 0,oi mm. . C. biconstricta Geove a. Stttet. 



J _ _ 13 _ . . . . 29. 



\ — — 19 — . . . . C. Schumanniana var. trinodis. 



j Longitudinal lines double . C eximia Grdn. 



\ — — single, inframarginal . C. adenensis Cl. 



j Valve lanceolate, margins convex . . .31. 



\ — linear — parallel . . .49. 



I Central area with lunate marks ... . . . . .^ . . . . . . 3S. 



I — — without — . . . . ; .' . . . 33. 



I Freshwater species i . . C. Schumanniana Grun. 



\ Marine — C. samoensis Grun. 



j Valve asymmetrical ... ......... C. curvinervia Grun. 



\ — symmetrical 34. 



I Only the portion around the median line striate ... C dispersa Ghowe a. Start. 



\ Marginal portion of the valve striate . ... ... 35. 



( Longitudinal lines broad ... 36. 



\ — — fine 38. 



{Longitudinal lines dilated to broad, lunate areas Q. Jeryophila Cl. 

 — — linear bands ... . . 37 



I Longitudinal bands and central areas united C. Castracanei Geun. 



I — ~ "ot (J biseriata Pet. 



16. 

 17. 

 18. 

 19 

 20. 

 21 

 22 

 23. 



25, 

 26. 



27. 



28. 



39. 

 30. 

 31. 

 32. 

 33. 

 34. 

 35. 

 36. 

 37. 



