ioo TUFTS COLLEGE STUDIES, VOL. IV, No. 7 



5. Pyramimonas tetrarhynchus, after Stein. X 1000. 



6. (a) Dicranochaete reniformis, after Hieronymus. X 400. 



6. (b) " " " " X6oo. 



7. Gloeochaete Wittrockiana, after Nordstedt. X 1000. 



8. Closteriopsis longissima, var. tropica, after West. 



X 520. 



9. Quadrigula closterioides, after Printz. X 1000. 



PLATE II 



10. Glaucocystis nostochinearum, after West. X 1000. 



n. Micractinium radiatum, after Chodat. X 800. 



12. Franceia ovalis, after Pascher. X 500. 



13. Acanthosphaera Zacharaisi, after Pascher. X 800. 



14. (a) Elakatothrix gelatinosa, after Wille. X 224. 

 14- (*) " " . " " X 570. 

 14- (') " " X 570. 

 14- 00 X 242. 

 14- (') X 570. 



15. Phytomorula regularis, after Kofoid. X 1125. 



16. Tetradesmus wisconsinensis, after Smith. X 3300. 



17. (a) Westella botryoides, after West. X 780. 



17. (b) " " X 1245. 



18. Tetrastrum staurogeniaeforme, after Chodat. X 1500. 



19. Euastropsis Richteri, after Schmidle. X 1000. 



20. Chaetonema irregularis, after Huber. X 300. 



PLATE in 



21. Geminella scalariformis, after West. X 780. 



22. (a) Oedocladium albemarlense, after Lewis. X 200. 



22. (b) " V " X 200. 



23. Phaeophila floridearum, after Hauck. X 300. 



24. (a) Chlorosarcina lacustris, after Snow. X 500. 

 24- W " X 5o- 



24. (c) X 5o- 



25. Gloeocystopsis limneticus, after Smith. X 1000. 



26. (a) Coccomyxa dispar, after Schmidle. X 800. 



26. (b) " . . X 800. 



27. Ernodesmis verticillata, after Borgesen. X a. 



28. Rhipilia tomentosa, after Gepp. X 40. 



