PLATE 10. Desmidiacea. 



Figure 



1. Hyalotheca dissiliens, front view. 



2. Hyalotheca dissiliens, side or end view. 



3 1 



4 * > Hyalotheca dissiliens, conjugating cells, with sporangia. 



5. Didymoprium Grevillii, front view. 



6. Didymoprium Grevillii, side view. 



7. Desmidium Swartzii, front view. 



8. Desmidium Swartzii, side view. 



9. Sphcerozosma vertebratum, front view. 



10. Sphcerozosma vertebratum, side view. 



1 1 . Micrasterias denticulata, cell dividing. 



12. Micrasterias denticulata, sporangium. 



13. Micrasterias rotata. 14. Euastrum verrucosum. 

 15. Euastrum oblonaum. 16. Euastrum Didelta. 



17. Euastrum didelta, cell free from contents. 



18. Cosmarium pyramidatum. 19'. Cosmarium pyramidatum, empty cell 

 20. Cosmarium crenatum. 21. Cosmarium margaritiferum. 



22. Cosmarium tetraophthalmum. 



23. Xanthidium armatum. 24. Xanthidium armatum, empty cell. 



25. Xanthidium fasciculatum. 



26. Staurastrum dejectum. 27. Arthrodesmus convergens. 



28. Staurastrum margaritaceum, front view. 



29. Staurastrum margaritaceum, side view. 



30. Staurastrum gracile, front view. 31. Staurastrum aracile, side view. 



32. Didymocladon furcigerus, front view (fig. 56, side view). 



33. Tetmemorus aranulatus. 



34. Tetmemorus aranulatus, empty cell. 



35. Tetmemorus Icevis, in conjugation. 



36. Penium Brebissonii. 



37. Penium margaritaceum, empty cell. 



38. Docidium truncatum. 



39. Docidium baculum. 



40. Closterium lunula. 



41. Closterium acerosum. 



42. Closterium acerosum, in conjugation. 



43. Closterium moniliferum. 



44. Closterium didymotocum. 



45. Closterium setaceum. 



46. Closterium setaceum, in conjugation. 



47. Ankistrodesmus falcatus. 



48. Pediastrum Boryanum. 



49. Pediastrum aranulatum, empty cell. 



50. Scenedesmus quadricauda. 



51. Scenedesmus obliquus. 



52. Aptogonum desmidium, side view (fig. 55, front view). 



53. Scenedesmus obtusus, just after division. 



54. Scenedesmus obtusus, ordinary state. 



55. Aptogonum desmidium, front view (fig. 52, side view). 



56. Didymocladon furcigerus a, side view (fig. 32, front view). 



57. Closterium Grijffithii. 

 58. 



