194 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Description. — The body is stout ovoidal in ventral view, flattened dorsoventrally, its length 

 1.3 transdiameters at the widest part and its dorsoventral diameter 0.75 transdiameter. The 

 epicene and hypocone are subequal in length, the greater width of the hypocone giving it a 

 slightly greater volume. The epicene is subhemispherical in outline, its length about 0.43 of 

 the total length of the bodj\ The hypocone is more sjinmetrical than the epieone, broad and 

 rounded posteriorly. 



The girdle is slightly premedian in position and forms a complete circle around the body. 

 The furrow is wide, about 0.2 transdiameter, and rather deeply impressed. The sulcus extends 

 from the girdle to the antapex as a wide furrow which is slightlj' deflected to the left posteriorly. 

 The flagellar pores are not indicated in Klebs's (1912) figures. 



The nucleus is a small, spheroidal body near the central part of the cell. Its diameter is 

 0.3 transdiameter of the body. A number of radially arranged, stout rod-shaped bodies are 

 found in the cytoplasm similar to the chromatophores in G. rot unci at urn. but their function is 

 not mentioned in the description of Klebs (1912). 



DiMENSioxs. — Length, 20-24/^ ; transdiameter, 16-18/^; dorsoventral diameter, 

 12/i ; diameter of nucleus, 6^. 



OcciiEEExcE. — Tliis species was figured by Klebs (1912) from fresh-water 

 ponds in the Botanical Garden at Buitenzorg. Java. 



CoMPAEisoxs. — This species greatly resembles G. rotundntinn Klebs (1912), 

 differing from it, however, in being flattened dorsoventrally and of somewhat 

 smaller size, as well as being, in so far as known, a tropical species. Their 

 description in the same paper by the veteran protistologist and investigator of 

 the Dinoflagellata is an adequate guaranty of their specific distinctions. Its 

 resemblance to Ohuo's (1911) G. hiciliafiou has already been discussed. 



Gymnodinium canus sp. nov. 



Plate 4, figure 41 ; text figures Z, 1, 2 



DiAGxosis. — A large species with asymmetrical ovoidal body, its length 1.72 

 transdiameters, epieone sloping anterodorsally, with an apical horn ,• girdle sub- 

 median, displaced 0.18 transdiameter; sulcus extends from apex to antapex; 

 surface coarsely striate ; color greenish grey. Length, 112/^. Pacific off La Jolla, 

 California, August. 



Descriptiox. — Body large, asjTnmetrically ovoidal in lateral view, widest posteriorly, its length 

 1.72 transdiameters at the widest part, which is in the anterior third of the hypotheca. The 

 ventral aspect presents an approximately symmetrical outline. In lateral view it is seen that 

 the dorsoventral diameter, which equals the transdiameter posteriorly, in the epieone diminishes 

 towards the apex which is eccentricallj- placed near the dorsal face of the body. The ventral 

 surface forms an angle of about 50^^ with the transverse plane for about 0.7 of the height of 

 the epieone, beyond which the slope approaches the transverse direction again for a short 

 distance, then ascends longitudinally to the contracted, obliquely truncate and notched apex. 

 The dor.sal face of the epieone forms a slightly convex line from girdle to apex. Owing to the 

 diminished dorsoventral diameter the epieone is considerably smaller in size than the hypocone, 

 though their relative lengths are about the same. The length of the epieone on the left and 

 right sides is about 0.43 and 0.53 respectively of the total length of the body. In ventral view 

 it is dome-shaped with rounded sides; the apex is contracted and elongated with a slight twi.st 



