214 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



The girdle is somewhat submedian in position, meeting the sulcus proximally about 0.5 of 

 the total length of the body from the apex and distally 0.55, being displaced about its own width. 

 The furrow is wide, 0.06 transdiameter, and shallow. The flagellar pores and flagella were not 

 noted by Schiitt (1895). 



The nucleus is ellipsoidal and is located near the antapex. It is filled with coarse, chromatin 

 granules. Its major and minor axes are about 0.4 and 0.35 transdiameter respectively in length. 

 The anterocentral part of the body is occupied by a large brownish mass, evidently a food botly. 

 The remainder of the body is filled with vacuoles of varying sizes. Color greenish grey. Scat- 

 tered over the surface of Schiitt 's (1895) figure are small, blister-like projections. These were 

 not observed in our specimen and are probably indicative of approaching cytolysis. No pusules 

 were noted. 



DiMExsioxs. — Length. 80-126/^: transdiameter, 59-80m; axes of nnelens, 

 17-24/^ l)y 28/^. 



OccirREExcE. — This was fignred hy Schiitt (1895) from tlie collection of the 

 Plankton Expedition from the Bay of Xaples or from the Atlantic. A single 

 specimen was taken 6 miles off La Jolla, California, July 1, 1906, in a haul 

 from 995 meters to the surface. L'nfortunately no color notes were made of 

 this individual. 



CoMPAEisoxs. — Its thickened periplast, though lacking distinct ectoplasmic 

 differentiation, places it in the suhgenus Pochydiinum, near G. pacliijdermatum 

 (fig. AA. 5), hut its girdle is more nearly sulnnedian, its form less rotund, and 

 it wholly lacks striae. The possession of an apical point is imusual in this 

 subgenus. 



Gymnodinium gracile Bergh 



Plate 2, figure 19 ; text figure Z, 3 



Gymnodinium gracile Bergh (1SS1&), pp. 251-253, pi. 16, figs. 68, 69. 



G. gracile, Entz, Sr. (1882), p. 189; Entz, Jr., as Spirodinium gracile (1902), p. 124; 

 (1907), p. 17; (1909), p. 254. 



G. gracile, Biitschli (1SS5), pp. 962, 964, 975, 1017, pi. 51. fig. 4. 



G. gracile, Penard (1891), p. 59. 



G. gracile. Schilling (1891), pp. 200, 206. 



G. gracile, Lemmermann (1899), p. 358; (1902), p. 260. 



G. gracile, Ostenfeld (1906), p. 6; (1913), pp. 123, .338, 344. 



G. gracile, Paulsen (1907), p. 23; (1908), p. 98, fig. 133. 



G. gracile, Wright (1907), p. 5, pi. 1, fig. 9. 



Not Gymnodinium gracile Pouchet (1883, p. 446. pis. 20-21, fig. 39) ; (1885o, p. 97) ; 

 Schiitt (1887, pp. 373, 374) ; Faure-Fremiet (1914, p. 42). These references all deal 

 with Pouchet 's figure and description, both of which leave his form indeterminable. 



DiAGxosis. — A large species with long, suliovoidal or ellipsoidal body, its 

 length 2.1 transdiameters, epicone subconical; girdle premedian. displaced 

 about twice its own width ; sulcus extending from near apex to antapex ; surface 

 finely striate; color yellowish. Length, 105/*. Pacific off La Jolla, California, 

 July. August ; Baltic and Mediterranean seas, Cattegat, Atlantic. 



