PLATE IV. 



Kg. 1. 



>) 2. 



^> 3. 



» 4. 



» 5. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27. 

 28. 



and Rabh. — Nice, '""/i 



Caloneis Liber var. Bleischiana Jan 

 C. eximia Grun. — Cebu, ^""/j . 



C. clavigera Cl. — Colon, ^oo/^ 



C. Diisenii Cl. — Cameroon, ^""Z, 



C. latiuscuia var. africana Cl. — Cameroon, ^'"•/, 

 7. C. abnormis Grtjn. — Lysekil, "oo/i . . . 

 Navicula H. album Cl, — China, ^^Vi • • ■ ■ 

 » » » (part of the valve) i*"yj 



JSr. Ypsilon Cl. — Bory, 3»«/, 



N. clavata var. rhombica Cl. — Morocco, ^'"/j 



N. venustissima KiTTON — Hongkong, "'"/i . 



N. irrorata var. elliptica Cl. — Hungary, ^""/^ . . . 



N. Hennedyii var. Centraster Cl. — Mexillones, ^""j-^ 



Pleurosigma majus Grun. — Sumatra, ^^'/i • 



P. galapagense Cl. — Galapagos Islands, '""/, 



P. Exsul Cl. — Naples, ^^/^ 



P. formosum var. A reus Cl. — Macassar Straits 

 P. minutum Grun. — Malmo, ="»/, .... 

 P. Heros Cl. — Macassar Straits, ^^^/, . . . 

 P. formosum var. dalmatica Grun. • — Balearic 

 P. umbilicatum Cl. — Labuan, '••'/ .... 

 Cymbella hybrida Grun. — P&ron, i"""/, . . 

 C. Hauckii'VAN Hburck — Triest, i"""/, 

 C. oregonica Cl. — Oregon '""oy^ .... 

 C. acutiuscula Cl. — Waltham Mass. ^"""/^ . 



C. lata Grun. — PiteS, '"""/i 



C. lapponica Grun. — Gellivaara, '""% 



500 



'/l 



Islands, '^* 



'A 



Pa 



'age. 

 55. 

 56. 

 56. 

 59. 

 62. 

 61. 

 rt II. 



44. 

 36. 

 43. 



45. 



41. 



44. 



45. 



43. 

 166. 

 164. 

 167. 

 164. 

 165. 

 165. 



