KOPOIU AND SWEZY: UNARMORED DINOFLAGELLATA 293 



Small saeklike pusiiles open into each flagellar pore. The cj'toplasm is clear and transparent 

 and greenish yellow in color. Small, green oil droplets, a few dark refractive granules, and a 

 number of large pink vacuoles were scattered through it. The surface is striate. On the epieone 

 the striae are about 20 in number across one face, and on the hypocone about 1.5 times as many. 

 The striae are blue green in color. Scattered along tlie line of striae are masses of coral-red fluid 

 pigment. On the cpicone these are elongated, sometimes extending from the girdle to near the 

 apex in an unbroken line or they may be in shorter, thicker masses. On the hypocone they are 

 fewer in number, and more variable in size, usually minute and scattered scantily along the 

 striae, like beads on a string. Just underneath the pellicle are a number of large rounded masses 

 of pigment. These are found in both epieone and liypocone, but are more numerous and larger 

 in size in the epieone. Several of the elongated rodlike masses arc found at the antapex. Some 

 individuals observed contained large bodies and many vacuoles, evidences of holozoic nutrition 

 in this species. 



Dimensions. — Length, 124-158;*; transdiameter, 52-80/*; transdiameter of 

 micleiis, 30^0/t. 



OccrRRENCE. — Two specimens were taken Jidy 9, 1917, with a No. 25 silk 

 net, 4 miles off La Jolla, California, in a haul from 80 meters to the surface 

 and in a surface temperature of 19-2 C. It was fonnd again on July 11, in 

 approximately the same place and with the same apparatus. 



Co^NEPARisoNS. — In its nuclear structure, color, and arrangement of pigment 

 this species closely resembles G. virgatuni (pi. 10, fig. 112; fig. DD, 21). In the 

 relative proportions of the body and girdle displacement, however, it shows 

 considerable differences. The posterior portion of G. virgattim is somew^hat 

 distorted by the recent ejection of a food body, but this could hardly account 

 for the differences in size and proportion. The hypocone of G. coralJinum is 

 more finely striate, its displacement of girdle in relation to the transdiameter 

 less, and its jDosterior flagellar pore much farther below the posterior junction 

 of girdle and sulcus than in G. virgatum. 



Gyrodinium cornutum (Pouchet) 



Text figure EE, 9 



Gymnodinium spirale var. cornnium Pouchet (1885a.), j). 6f), pi. 4, fig. 31. 

 Spirodinium cornutum, Lemmermann (1899), p. 359. 



Not Gymnodinium cornutum Schiitt (1895), pi. 22, fig. 71 {=Gyrodinium. schuetti 

 (Schiitt)). 



Diagnosis. — A medium sized species with spindle-shaped body, its length 

 2.8 transdiameters ; girdle a descending left spiral, displaced about 1.21 trans- 

 diameters ; sulcus apparently extending to the antapex ; color, greenish. Length, 

 104". Atlantic off Concarneau, France, June. 



DescrH'Tion. — The body is spindle-shaped, widest at tln' middle and taiiering towards both 

 ends, its length 2.8 transdiameters at the widest part. The epieone is exceeded in size by the 

 hypocone, its Icngtli being 0.11 of its length less than that of tlie hypocone. The epieone is 

 conical (55°) with a narrow, blunt apex. Its lengtli on Ww left and right sides is 0.24 and 0.67 

 of the total length of the body. The hypocone has a l)luHt antapex and is furtlier marked off 

 by two protuberances on the ventral face which are probably the borders of the sulcal region. 



