KOPOID AND SWEZY: UNARMORED DINOFLAGELLATA 251 



Gymnodinium rotundatum Klebs 



Text figure X, 8 



Gymnodinium rotundatum Klebs (1912), pp. 392, 403, 439, fig. 5. 

 G. rotundatum, Cavers (1913), p. 182, fig. 9,_,. 

 G. rotundatum, Sehilling (1913), p. 16, fig. 13. 



Diagnosis. — A small species with rounded siibellipsoidal body, its length 1.1 

 transdiameters ; girdle without displacement; sulcus extending from girdle to 

 antapex: yellow chroma tophores. Length, 31/^. Fresh- water swamps near 

 Vernheim, Germany. 



Description'. — The body is stout ellipsoidal, its length 1.1 transdiameters at the widest part. 

 The epieone and hypocone are subequal in length. The epicene is hemispherical in shape, the 

 left side more convex than the right. Its length is about 0.5 the total length of the body. The 

 hypocone is broadly rounded with the antapex obliquely concave on the left side. 



The girdle is submedian in position and forms a complete circle about the body. Its distance 

 from the apex is about 0.5 of the total length of the body. The furrow is wide, about 0.1 trans- 

 diameter, and deeply impressed. The sulcus extends from the girdle to the antapex as a wide 

 furrow. The position of the flagellar pores is not indicated in Klebs 's (1912) figures. 



The nucleus is a small spherical body in the central part of the organism. Its diameter is 

 about 0.29 transdiameter in length. Numerous yellow rod-shaped ehromatophores are radially 

 arranged in the peripheral zone of the cytoplasm. 



Dimensions. — Length, 32-35/*; transdiameter, 22-25/*; diameter of nucleus, 

 4/^. In Klebs 's (1912, fig. 5c) tigaire, however, the dimensions are 34/* by 30/*, 

 and we have followed this in the figure and description given herewith, rather 

 than distort his figure to conform to the dimensions given in his text. 



OcCLTRRENCE. — This spocies has been described by Klebs (1912) from fresh- 

 water swamps near Vernheim (Reid, LTessen), Germany, and has not been noted 

 elsewhere. 



Co:mpabisons. — This species is near G. vherriDiiOH in proportions, but is 

 somewhat more rotund anteriorly and less synunetrical posteriorly. Its ehro- 

 matophores resemble those of G. mirahile and G. uhcrrimniii in being rodlike 

 and radially arranged. It is also near G. hogoriense of the same author (Klebs, 

 1912), from Java, Itut the latter is smaller and more regular in outline. 



Gymnodinium rubricauda sp. nov. 



Plate 8, figure 88 ; text figure X, 4 



Diagnosis. — A medium sized species with subovoidal body, its length 1.25 

 transdiameters; girdle sidimedian, without displacement; sulcus extending 

 from apex to antapex; color, rose red. Length, 69/t. Pacific off La Jolla, 

 California, July, August. 



Description. — The bwly is subovoidal. widest posteriorly, tapering anteriorly, its length 1.25 

 transdiameters at the widest part. In cross-section the body is nearly circular with a deep 



