48 P. T. CLEVE, SYNOPSIS OF THE NAVICfLOII) DIATOMS. 



. j Striai about 21 in 0,ol mm C. wiiiula A. S. 



■ \ — — 95 — — C. fasciata Lägst. 



( Valve lanoeolate Ii. 



11. I — constricted 14. 



( — biconstricted 10. 



Ends capitate C. Becctirlnna Gruii. 



— not — 13. 



Valve troehiform C. hodosensis Pant. 



— elliptical-lanceolate C. hottnica Cl. 



Axial area indistinct C. galnpagensin Ol. 



— — distinct or ratlier broad 15. 



12. 



la. 



14. 



l(i 



f Striai 6 in 0,oi mm. . . . . . . . . . . C. Bcintillmis Bn. a. Temp. 



]'). — 9 — C. Hardmaniana Cl. 



\ — Ib — '........., C. galapage.nsis rar. japonlca. 



Stria; G to 11 in 0,0 1 mm ..'.'..'.:.- 17. 



— about 90 in 0,0 1 mm ■'-..'.■ 18. 



„ j Median segment large C. ophiocephnla Cl. 



1 — — small C. formicina Gruk. 



..„ I Longitndinal lines median C. clavigcr Cl. 



' \ — — indistinet C. colinnbiensis Cl. (f. Schunianinna var. Heribaudi Féra^c). 



I Valve constricted 90. 



\ — not — 30. 



^-, j Valve constricted in the middle . . , .... -.-, .vm.k. ;i 21. 



" ' \ — biconstricted '....."... 25. 



„ I Striai 7 to 12 in 0,oi mm 22, 



I Stria 



\ — about 23 — X Liber rar. Janischiana. 



rea indistinct C. Liber var. Bleischiann. 



— distinct 23. 



J Central and axial area united in a naiTow lanoeolate space 24. 



\ Central area qiiadrate C. PoireUii rar. Barfholomei. 



Q, I Longitudinal lines broad C. Musra Gkeö. 



~ ' \ — — narrow C. Kiiikeriana Truax. 



or ) Small forms (L. 0,03 to 0,01 mm.) 90. 



\ Larger — -27. 



„ > j Ends broad C. lobnta Schwartz. 



\ — acuminate C. egena A. S. 



jj_ j Axial area broad C. bida rata Cl. a. Grove. 



" ' \ — — narrow ■ 28. 



[ StriiE about H in 0,oi mm C. biconatricta Grove a. Stcrt. 



28. ■ — — 13 — 91). 



( — — lil — C. Sclmmanniana var. trinodif!. 



^^ J Longitudinal lines donble C. eximia Gbun. 



"" ■ \ — — single, infraniarginal C. adenensis Cl. 



,, J Valve lanceolate, margins convex 31. 



\ — linear — parallel 4!t. 



„.. I Central area witb lunate marks 32 



J Ce 



'I — — witliout — 33. 



,,g I Fresliwater species C. Schmimnniana Grun. 



I Marine — C. sa)ii0CHsis Gkun. 



„„ I Valve asymmetrical C. curvinervia Gruk. 



\ — symmetrical 34. 



.^ J Only the portion aronnd tlie median line striate C. dispersa CtROwe a. Start. 



\ Marginal portion of tbe valve striate 35. 



„r I Longitudinal lines broad 30. 



) - — fine 38. 



, , I Longitudinal lines dilated to broad, lunate areas C. Icri/ophila Cl. 



' \ — — linear bands 37. 



.,„ j Longitudinal liands and central areas united C. Castracanei Gbun. 



1 — — — — not C. biseriata Pet. 



