CONTENTS V 



Page 



Figures 14, 15. Photomicrographs of: 



14. Pediastrum 41 



15. Scenedesmus 43 



16-20. Drawings of: 



16. Schroederia 45 



17. Selenastrum 47 



18. Sphaerocystis 49 



19. Tetraedron 51 



20. Tetrastrum 53 



21-25. Photomicrographs of: 



21. Euglena 55 



22. Trachelomonas 57 



23. Achnanthes 59 



24. Amphora 61 



25. Asterionella 63 



26, 27. Scanning electronmicrographs of: 



26. Cocconeis 65 



27. Cyclotella 67 



28-30. Photomicrographs of: 



28. Cymbella 69 



29. Diatoma 71 



30. Dinobryon 73 



31. Scanning electronmicrograph of Epithemia 75 



32. Drawing of Eunotia 77 



33-35. Photomicrographs of: 



33. Fragilaria 79 



34. Gomphonema 81 



35. Gyrosigma 83 



36. Scanning electronmicrograph of Melosira 85 



37-40. Photomicrographs of: 



37. Navicula 87 



38. Nitzschia 89 



39. Pinnularia 91 



40. Rhoicosphenia 93 



41. Scanning electronmicrograph of Stephanodiscus 95 



42. Photomicrograph of Surirella 97 



43. Drawing of Synedra 99 



44, 45. Photomicrographs of: 



44. Tabellaria 101 



45. Glenodinium 103 



46-48. Drawings of: 



46. Peridinium 105 



47. Chroomonas 107 



48. Cryptomonas 109 



49-52. Photomicrographs of: 



49. Agmenellum 111 



50. Anabaena 113 



51. Anacystis 115 



52. Aphanizomenon 117 



53, 54. Drawings of: 



53. Cylindrospermum 119 



54. Gomphosphaeria 121 



