146 MEMOIRS OP THE UNIVERSITY OP CALIFORNIA 



CoMPAEiso^T. — This is probably the fresh-water representative of a marine 

 species, .1. turho, both possessing some characteristics in common, the differences 

 being probably due to the change in mediiun. 



Amphidinium lanceolatum Schroder 



Text figure U, 9 



Amphidinium (?) lanceolatum Sehriider (1911), p. 650, fig. 15. 

 A. lanceolatum, Schiller (1912), p. 493. 



Diagnosis. — A small species with slender body, tapering posteriorly, its 

 length 3.33 transdiameters ; girdle far anterior; eiDicone minute, rounded, 0.33 

 transdiameter in width; sulcus not indicated; nucleus near center of body; 

 cytoplasm filled with spherules of varying sizes; colorless. Length, 30 to 35/^; 

 transdiameter, 9m. Adriatic Sea near Roviguo, Austria. 



Schroder (1911) questions the inclusion of this form with A»iphidi)tiMm. 

 His data, unfortunately, are very meager and need confii'mation, 1)ut the minute 

 size of the epicone, separated by the girdle from the elongated body, suggests 

 the usual relations of these structures in Amphidiuium. It is therefore placed 

 in the genus, tentatively, imtil it has been found again and its structure more 

 fully determined. Its proportions are suggestively like those of O.fytoxum, but 

 there is no indication of a theca in either figure or description. 



Amphidinium longum Lolmiann 

 Text figure U, 7 



Amphidinium longum-, Lolimann (1908), pp. 252, 201, 262, 366, 368, pi. 17, fig. 15; (1911), 



p. 31. 

 A. longum, Paulsen (1908), p. 96, fig. 131. 

 A. longum, Herdman (1911), pp. 71, 72; (1911), p. 38. 

 A. longum, Schroder (1911), pp. 625, 651. 

 A. longum, Lebour (19176), p. 188. 



Diagnosis. — A minute species, with subovoidal body, its length 2.27 trans- 

 diameters ; girdle anterior ; epicone minute. Length, 25^*. Baltic Sea off Kiel, 

 Germany, July, August ; Adriatic Sea near Lucietta, Austria-Hungary. 



Description. — The body is subovoidal, widest anteriorly behind the girdle, tapering slightly 

 posteriority, its length 2.27 transdiameters at the widest part. The epicone is a minute triangular 

 portion with a sharply pointed apex, and a length of 0.12 of the total length of the body. The 

 hypocone is broad anteriorly, tapering posteriorly to a narrow, rounded antapex. 



Lohmann's figure (1908) shows what is apparently the dorsal side only, with no indication 

 of the course of the remainder of the girdle and the sulcus. The girdle as figured is a broad 

 (0.27 transdiameter), deeply impressed furrow extending transversely across the body at a 

 distance from the apex of 0.12 of the total length of the body. 



