KOPOID AND SWEZY: UNARMORED UINOFLAGELLATA 197 



smooth rounded borders. The sulcus is short on both epicone and hypoeone, broad anteriorly 

 and narrowing to a i)oint posteriorly. In several individuals it extended posteriorly to the 

 antapex. The anterior flagellar pore opens at the proximal junction of the girdle and sulcus, 

 the posterior pore slightly below the distal junction. 



The nucleus is ellipsoidal, its major axis coinciding with the major axis of the body, and is 

 centrally located. Large monliforni chromatin threads followed its major axis. Its major and 

 minor axes are 0.77 and 0.54 transdiameter respectively. 



A verj^ large, irregular, saeklike pusule opens into both flagellar pores. The cytoplasm is 

 clear and without visible granulations or color. A very few green oil droplets were present. 

 Numerous ellipsoidal, disklike chromatophores are scattered through the peripheral layer. These 

 have a general tone of yellow ochre. The organism is closely invested with a thin-walled, hyaline 

 cyst which follows the contour of the body. 



Dimensions. — Length, 26/^; transdiameter, 22/s axes of utu-leus, 17/* and 12/^. 



OccuKRENCE. — It was first met with July 21, 1906, at La Jolla, California, 

 in a haul made with a No. 20 net from 565 meters to the surface. One indi- 

 vidual was taken July 5, 1917, with a No. 12 silk net, 6 miles off La Jolla, in a 

 haul from 80 meters to the surface in a surface temperature of 21-4 C. It was 

 fotmd again July 23, at approximately the same place, with the same apparatus 

 and in a surface tempei'ature of 20-2 C. 



Comparisons. — This species shows some slight resemblances to Gymnodinium 

 man' 111(1)1 Kent. It differs from that species, however, in its proportions, its 

 smaller epicone, reduced sulcus, and in its possession of yellow ochre chromato- 

 phores. No food masses were observed in the cytoplasm and the presence of 

 chromatophores would suggest a holophytic mode of nutrition. Saville-Kent's 

 (1880-82) species is holozoic. He observed it actively feeding on minute flagel- 

 lates in the same culture. It belongs in the subgenus Gij)U)iodi)iiuin. 



Gymnodinium coeruleum Dogiel 



Text figure Z, 4 



Gijmnodi Ilium cornilrum Dogiel (1906), pp. 35, 36, 40. pi. 2, figs. 46-47. 

 G. coeruleum, West (1916), p. ryZ. 



Di.\GNOSis. — A rather large species with body sulxdlipsoidal, its length about 

 2 transdiameters ; epicone and hypoeone subequal approaching spheroidal form; 

 girdle submedian, displaced 0.28 transdiameter, stdcus extending f I'om near the 

 apex to the antapex; surface striate; color, cornflower blue. Length, 115/*. 

 Mediterranean Sea off Naples, June ( ?) . 



Description. — The body is stout subellipsoidal with broad apices, nearly circular in cross- 

 section, its length about 2 transdiameters at the widest part. Tlie epicone and hypoeone are 

 subequal and both are broadly rounded. The epicone is rounded with hemispherical apex. It 

 has a length on the left and right sides of about 0.4 and 0..5 respectively of the total length of 

 the body. The hypoeone is somewliat less syiiunetrieal than the epicone and a trifle more 

 elongated and deeply notched at the antapex by the distal end of the sulcus. 



The girdle joins the sulcus proximally at a distance from the ay)ex of about 0.4 and distally 

 0.5 of the total length of the body. It follows a descending left spiral course about the body, 



