132 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



12. Plasma yellow, length over lOO^t 13 



12. Plasma colorless or gi-eenish yellow, length less than lOO/t 14 



13. Surface with furrows and fine striae cucurbita sp. nov. 



13. Surface with few ridges fastigium sp. nov. 



14. Ectoplasm thick, color yellow vasculum sp. nov. 



14. Periplast thin 15 



15. Surface with longitudinal furrows cucurbitella sp. nov. 



15. No furrows pacificum sp. nov. 



16. Length over 30/i 17 



16. Length less than 30/i 18 



17. Body asymmetrical, one leaflike chromatophore, surface finely striate 



asymmetricum sp. nov. 



17. Sjinmetrical, many elliptical chromatophores, coarsely striate galbanum sp. nov. 



18. Length less than 1.5 transdiameters 19 



18. Length over 1.5 transdiameters 21 



19. Hypocone suhconical, chromatophores bright yeUow rotundatum Lohmaun 



19. Hypocone subspheroidal 20 



20. Marine, colorless turbo sp. nov. 



20. Fresh water, brown chromatophores lacustre Stein 



21. Body stout, length 1.6 transdiameters crassum Lohmann 



21. Body elongated, length over 2 transdiameters longum Lohmaun 



Amphidinium aculeatum Daclay and 

 Amphidinium aculeatum Schroder 



Text figures U, 8, 17 



Amphidinium aculeatum Daday (1888), p. 104, pi. 3, fig. 10. 



A. aculeatum Schroder (1900), p. 13; (1911), pp. 616, 650, fig. 14, as a new species. 



A. aculeattim, Lemmermann (1901a), p. 358. 



A. aculeatum, Kofoid (1907), p. 301. 



A. aculeatum. Herdman (19116), p. 72; (1911c), p. 39. 



Syxoxymy. — Under this name Daday (1888) figured (our text fig. U, IT) 

 an organism from the Gulf of Naples which has no apparent affinities with the 

 genus Amphidinmm. It has no girdle and is covered with a "Panzer," or coat 

 of mail, thickly beset with spines. Whatever its affinities may be, they must be 

 looked for outside the genus Amphidinium. Schroder (1900) accepts Daday 's 

 species, yet in a later memoir (1911) he figures another organism (our text fig. 

 U, 8), from the Adriatic Sea, as "Amphidinium aculeatum nov. spec." which 

 is unlike Daday 's form and at the same time presents no Amphidinium char- 

 acteristics. Its girdle is slightly posterior to the median plane, making the 

 epicone and hn^oeone subequal. These characters alone would suffice to throw 

 it outside the genus A mph idiniu m . Too little data are given to place it elsewhere 

 with any degree of certainty. 



