238 MEMOIKS OF THE UNIVERSITY OF CALIFORNIA 



shape, flaring posteriorly, with a length of 0.69 of the total length of the body. The hypoeone 

 is rounded truncate, slightly notched by the distal end of the sulcus. 



The girdle is posteriorly placed, its distance from the apex being 0.69 of the total length of 

 the body. It forms a complete circle around the body, the ends meeting without displacement. 

 The furrow deeply undercuts the anterior border of the epicone and is almost obscured by the 

 lip thus formed. The sulcus extends from the girdle to the antapex. The flageUa were not 

 figured by Pouchet (1887), whose figures form the basis of this description. 



The interior of the body is filled with numerous spherules, among which the nucleus is not 

 distinguished. Two minute red pigment spots are found ventrad posterior to the junction of 

 the girdle and sulcus. Pouchet (1887) figures four schizonts within an ellipsoidal cyst approxi- 

 mately the size of the free flagellate. In his figure 6 D, plate 10, Pouchet has figured a form 

 which evidently does not belong to the species, G. musei, differing too greatly in proportions 

 from his figures 6 A and 6 B to have any close relationship with them. 



DiJMExsioxs. — This was described l)ut not figured by Danvsz (3887) from 

 pools at Paris, France. In the same year Pouchet figured this form in material 

 taken from the same place. 



Syxoxymt. — Entz (1909) quotes Danysz's description of this species with 

 the species name spelled musci, a lapsus for musei. 



Comparisons. — The description and figures of this species are so inadequate 

 that comparisons are tentative. It appears to be unique in the excessively large 

 epicone, which has nearly three tmies the volimie of the h^'jiocone. The nearest 

 approach to these proportions appears in G. vorticella Stein (fig. X, 29) and 

 G. dissiiniJe sp. nov. (fig. X, 32). The stigma in all of Pouchet's figures (1887) 

 is double, consisting of a larger and smaller parallel moiety, a condition of this 

 organ tmique in this genus. 



Gymnodinium ovulum sp. nov. 



Plate 5, figure 58 ; text figure X, 15 



DiAGxosis. — This is a minute species with spheroidal body, its length and 

 transdiameter subequal; girdle submedian. without displacement, sulcus short 

 on both epicone and h^i^ocone; colorless. Length, 28m. Pacific off La Jolla. 

 California, July, August. 



DESCErPTiON. — The body is spheroidal, circular in cross-section, apices broad and rounded, 

 its length and transdiameter equal. The hypoeone is very slightly larger than the epicone. The 

 epicone is subhemispherical in shape, its sides less convex than those of the hypoeone. The 

 apex is broad and smoothly rounded. It has a length of 0.44 of the total length of the body. 

 The hypoeone is hemispherical in shape with smoothly rounded sides and broad antapex. 



The girdle is submedian in position, its distance from the apex 0.44 and from tlie antapex 

 0.46 of the total length of the body. The furrow is wide, about 0.1 transdiameter, and deeply 

 impressed, its sides gradually curving outward to the surface of the body. The sulcus is a 

 shallow trough beginning midway between girdle and apex and extending to within a short 

 distance of the antapex. It follows a slightly sinuous course, enlarging at the girdle, narrowing 

 toward both ends. The anterior flagellar pore opens at the junction of the girdle and sulcus, 

 the posterior pore a short distance below. 



