IV CONTENTS 



Page 



Descriptions of the genera- Continued 



Chrysophyta - Continued 



Melosira 84 



Navicula 86 



Nitzschia 88 



Pinnularia 90 



Rhoicosphenia 92 



Stephanodiscus 94 



Surirella 96 



Synedra 98 



Tabellaria 100 



Pyrrophyta 102 



Glenodinium 102 



Peridinium 104 



Cryptophyta 106 



Chroomonas 106 



Cryptomonas 108 



Cyanophyta 110 



Agmenellum 110 



Anabaena 112 



Anacystis 114 



Aphanizomenon 116 



Cylindrospermum . 118 



Gomphosphaeria 120 



Lyngbya 122 



Oscillatoria 124 



Phormidum 126 



Raphidiopsis 128 



Glossary 130 



Selected references 133 



ILLUSTRATIONS 



Figures 1-4. Drawings of: 



1. Actinastrum 15 



2. Ankistrodesmus 17 



3. Chlamydomonas 19 



4. Chodatella 21 



5. Photomicrograph of Coelastrum 23 



6, 7. Drawings of: 



6. Cosmarium 25 



7. Crucigenia 27 



8. Photomicrograph of Dictyosphaerium 29 



9, 10. Drawings of: 



9. Golenkinia 31 



10. Kirchneriella 33 



11,12. Photomicrographs of : 



11. Micractinium 35 



12. Oocystis 37 



13. Drawing of Pandorina 39 



