PLATE 14. Desmidiacese. 



Figure 



1. Hyalotheca dissiliens, front view. 



2. Hyalotheca dissiliens, side or end view. 



q 1 



^ > Hyalotheca dissiliens, conjugating cells, with sporangia. 



5. Didymoprium Orevillii, front view. 



6. Didymoprium Grevillii, side view. 



7. Desmidium Sivartzii, front view. 



8. Desmidium Swartzii, side view. 



9. Sphcerozosma vertebratum, front view. 



10. Sphcerozosma vertebratum, side view. 



11. Micrasterias denticulata, cell dividing. 



12. Micrasterias denticulata, sporangium. 



13. Micrasterias rotata. 



14. JEuastrum verrucosum. 



15. Euastrum oblonyum. 



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. Xantkidium armatum, empty cell. 



25. Xanthidium fasciculatum. 



26. Staurastrum dejectum. 



27. Arthrodesmiis convergent. 



28. Staurastmm margaritaceum, front view. 



29. Staurastmm margaritaceum, side view. 



30. Staurastmm gracile, front view. 



31. Staurastrum gracile, side view. 



32. Didymocladonfurcigerus, front view ; fig. 56, end view. 



33. Tetmemorus granulatus. 



34. Tetmemorus granulatus, 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. Ankistrodesmusfalcatus, 



48. Pediastrum Boryanum. 



49. Pediastrum granulatum, empty cell. 



50. Scenedesmus quadricauda. 



51. Scenedesmus obliquus. 



52. Aptogonum desmidium, side view ; fig. 55, front view. 



53. Scene.desmus obtusus, just after division. 

 24. Scenedesmus obtusus, ordinary state. 



55. Aptogonum desmidium, front view ; fig. 52, side view. 



56. Didymocladonfurcigerus', a, end view; fig. 32, front view. 



57. Closterium Oriffithii. 



58. _ 



59. Spirotcenia condensata. 



