456 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



EXPLANATION OF PLATES. 



PLATE I. 



1. Botrydiopsis eriensis, after Snow. 1000 X i. 



2. Ophiocytium majus, after Nageli. 500 X i. 



3. Chlorobotrys regularis, after West. 350 X i. 



4. Conferva bombycina, after West. 750 X i. 



5. Botrydium granulatum, after West. 15 X i. 



6. Characiopsis minuta, after West. 350 X i. 



7. Zygneraa stellinum, with spores, after West. 300 X i. 



8. Spirogyra protecta, with spores, after Petit. 250 X i. 

 ga. Debarya glyptosperma, conjugating ; gb, with ripe spores ; 



after De Bary. 250 X i. 



10. Zygogonium ericetorum, conjugating, after De Bary. 



400 X i. 



11. Gonatonema ventricosum, with spores, after West. 800X1. 



PLATE II. 



12. Mougeotia viridis, with spores, after De Bary. 1000 X i. 



13. Chlamydomonas angulosa, after Dill. 1000 X i. 



14. Haematococcus pluvialis, after Hazen. 700 X i. 



15. Chlorogonium euchlorum, after Stein. 1000 X i. 



1 6. Goniurn pectorale, after Migula. 600 X i. 



17. Pandorina Morum, after Pringsheim. 700 X i. 



1 8. Pleodorina illinoisensis, after Kofoid. 500 X i. 



PLATE III. 



19. Platydorina caudata, face view, after Kofoid. 500 X i. 



20. Platydorina caudata, side view, after Kofoid. 300 X i. 



21. Eudorina elegans, after Gbbel. 300 X i. 



22. Volvox globator, after Oltmanns. 300 X i. 



23. Palraella miniata, after Nageli. 400 X i. 



PLATE IV. 



24. Botryococcus Braunii, colony dividing, after , West. 



600 X i. 



25. Ineffigiata neglecta, after West. 700 X i. 



26. Tetraspora lubrica, after Nageli. 400 X i. 



