350 MEMOIRS OP THE UNIVERSITY OF CALIFORNIA 



Key to the Species of Cochlodinium 



1. Girdle with 1.5-2.5 turns 2 



1. Girdle with 3-4 turns (subgenus Polydinium) 28 



2. Two sides of body symmetrical, girdle with 1.5-2.5 turns (subgenus Cochlodinium) 3 



2. Two sides of body markedly asymmetrical, girdle with 3—1: turns (subgenus Glyphodi- 



nium) 21 



3. Girdle with about 1.5 turns 4 



3. Girdle with about 1.7 turns 9 



3. Girdle with about 2-2.5 turns 13 



4. Surface not striate 5 



4. Surface striate 7 



5. Color reddish-grey, body biconieal scintillans sp. nov. 



5. Color green to yellow 6 



6. Body obovoidal, narrower posteriorly, green turbineum sp. nov. 



6. Body ellipsoidal, greenish yellow catenatum Okamura 



7. Length 200/^, with coral-red pigment miniatum sp. nov. 



7. Length less than 100/i, no red pigment 8 



8. Epieone smaller than hypocone, green volutum sp. nov. 



8. Epieone and hypocone subequal, yellow ochre pirum (Schiitt) 



9. Large species, 198/i, perinuclear zone present stran^ulatum Schiitt 



9. Smaller species, less than lOO/i, no perinuclear zone 10 



10. Cytoplasm colorless, body subelUpsoidal, 39/jl pellucidum Lohmann 



10. Color present , 11 



11. Girdle salient, body rose color, 90^ constrictum (Schiitt) 



11. Girdle not salient, body yellow 12 



12. Length 1.2 transdiameters, 40/^ conspiratum sp. nov. 



12. Length 2 transdiameters, 76/^ cereum sp. nov. 



13. Girdle with 2.5 turns, rase color archimedes (Pouchet) Lemm. 



13. Girdle with less than 2.5 turns, not reddish 14 



14. Large species, exceeding 100/t 15 



14. Smaller species, less than 100/i 16 



15. Body fusiform, 184/*, ochraceous with melanin atromaculatum sp. nov. 



15. Body club-shaped, larger anteriorly, 174ju, opaline green elongatum sp. nov. 



16. Color bluish with aster-purple splotches, body broadly ellipsoidal radiatum sp. nov. 



16. Color green to yellow 17 



17. Color yellow to yellowish green 18 



17. Color green 19 



18. Color amber yellow, not deeply constricted, radial rhabdosomes citron sp. nov. 



18. Color yellowish green, deeply constricted by sulcus and girdle virescens sp. nov. 



19. Length 1.66 transdiameters, antapex contracted, lumiere green lebourae sp. nov. 



20. Length 1.36 transdiameters, greenish grey faurei sp. nov. 



20. Length 1.50 transdiameters, glaucous gi-een clarissimum sp. nov. 



21. With vermiculate yellow ochre chromatophores, body contracted posteriorly 



geminatum (Schiitt) 



21. No chromatophores, antapex rotund except in cavatum , 22 



