268 MEMOIRS OF THE UNIVERSITY OP CALIFORNIA 



The nucleus is a large, ellipsoidal body found near the central part of the c\'toplasm. Its 

 long axis lies in the short plane of the body. Its major and minor axes are about 0.66 and 0.39 

 transdiameters in length respectively. 



The pusules were unusually large. The anterior one was spherical and thrown forward into 

 the epicone so that its outlet came at its posterior end. This reverses the usual position of this 

 organelle in the Gymnodiniidae. The posterior pusule was thrown to the right, the opening 

 being at the left side. It, also, was unique in that it had a slight purplish tinge. This may have 

 been due to the masses of that color around it. The cytoplasm is clear and very finely granular. 

 It contained no other cell inclusions except numerous small spherules of a bright yellow-green 

 color. The most striking featiire of the whole organism is its colored pigment. The general 

 tone of the protoplasm is pearl blue, shading to light glaucous blue at the girdle and near the 

 periphery. Near the surface are numerous, small, rounded or disk-shaped bodies, pansy violet 

 near the apex, shading to amaranth purple near the antapex. These pigment masses are some- 

 what more numerous in the hypocone than in the epicone. No striations or other surface 

 markings could be detected. 



DiMENSioxs. — Length, 60m ; transdiameter, 42y^ ; axes of nucleus, 28/* and 16/*. 



OccuERENCE. — This species is represented ])y a single specimen taken July 

 26, 1917, with a No. 25 silk net, in a haul 2.5 miles off La Jolla, California, from 

 80 meters to the surface and in a surface temperature of 21?8 C. 



CoMP.\Risoxs. — The color of this species finds its nearest counterpart in G. 

 piinicenm. Different shades of the general color are represented by PoucJietin 

 piirpurata and P. purpurescens. Like most of the species in this genus con- 

 taining colored pigment, it belongs in the subgenus Gijmnodinium. In its rather 

 stout, biconical shape it is allied to the subgenus Lineadinium (fig. Y), which 

 is mainly composed of biconical species. G. violescens, however, lacks surface 

 striae. It is cpiite distinct in proportions and color from the other two biconical 

 species, G. filum Labour (fig. X, 20) and G. fusus Schiitt (fig. X, 5) of the sub- 

 genus Gym nodinium. 



Gymnodinium viride Penard 



Text figure X, 24 



GymnofUmnm viride Penard (1891), pp. 11, 15, 22, 23, 33, 55, pi. 4, figs. 11-24. 



G. viride, Imhof (1892), p. 175. 



G. viride, Lemmermann (1900), p. 116; (1902), p. 260; (1910), p. 613, fig. 26, p. 623. 



G. viride, West (1909), p. 189; (1916), p. 52, fig. 38a. 



G. viride, Klebs (1912), p. 440. 



G. viride, Forti (1913), p. 32. 



G. viride, Cunha (1913), p. 105. 



G. viride, Schilling (1913), pp. 19, 64. 



Not Gymnodinium viride Schiitt (1895), pi. 26, fig. 88 i=Gyrodinium foliaccum). 



DiAGXosis. — A small species with ellipsoidal body, flattened dorsoventrally, 

 its length 1.3 transdiameters ; girdle displaced its own width ; sulcus extending 

 from near the apex to near the antapex; green chromatophores. Length, 35m. 

 Lake Geneva, Switzerland ; Brazil. 



