270 MEMOIRS OF THE UNIVERSITY OP CALIFORNIA 



G. vorticella, Schonichen and Kalberlah (1900), p. 231; (1909), p. 252. 



G. vorticella, Lemmermann (1900), p. 116; (1902), p. 260; (1910), pp. 565, 625, fig. 23. 



After Stein (1878). 

 G. vorticella, Levander (1900), pp. 58, 64, 96; (1901), p. 6. 

 G. vorticella, Dogiel (1906), p. 32. 

 6. vorticella, Kiister (1908), p. 352. 

 G. vorticella, Kleiber (1911), p. 14. 

 G. vorticella, Lauterborn (1913), p. 868. 

 G. vm-ticella. West (1916), p. 53. 



Diagnosis. — A minute species, witli ovoidal body, its length 1.1 transdiam- 

 eters; girdle displaced half its own width; sulcus short on both epicone and 

 hypoeone ; colorless, holozoic. Length, 24/*. In fresh-water ponds and swamps 

 in centi'al Europe. 



Description. — The body is broadly ovoidal, widest posteriorly, its length 1.1 tran.sdiameters. 

 The epieone greatly exceeds the hypoeone in size, its length being greater bj- 0.36 of its own 

 length. It is dome-shaped, with broad base and rounded apex. It has a length on the left and 

 right sides of about 0.52 and 0.58 respectively of the total leng-th of the body. Tlie hypoeone has 

 a length on the left and right sides of 0.25 and 0.29 of the total length. 



The girdle is postmedian in position, its junction with the sulcus occurring at about 0.50 of 

 the total length of the body from the apex. The furrow is deeply impressed and about 0.14 

 transdiameters in width. The sulcus is a shallow furrow reaching to near the antapex. 



The nucleus is a small spheroidal body in the center of the epicone, having a diameter of 

 about 0.2 transdianu'ter of the body. Food masses are frequently found in the colorles,s cytoplasm 

 with few or many minute siDherules. A red stigma is found in the posterior part of the sulcus. 

 Nutrition is holozoic. 



Dimensions. — Length, 23-24^; transdiameter, 20-21/*; diameter of nucleus, 

 4.5/*. 



Occurrence. — Figured by Stein (1883) from fresh water in the environs of 

 Prag. Entz (1896) notes its abundance in fresh water in Hungary. 



Comparisons. — This small colorless species is very close to Danysz's G. musei 

 (fig. X, 3), but appears to differ from it in proportions, being more ovoidal and 

 lacking in the posterior sulcal notch, as well as having but a single eyespot 

 instead of two. 



Gymnodinium wilczeki Pouchet 



Text figure Z, 8 



Gymnodinium wilczeki Pouchet (1894), pp. 170, 205, pi. 22, fig. 1. 

 G. tvilczeki, Lemmermann (1901), p. 358. 

 G. tvilczcki, Paulsen (1908), p. 108. 



DiAOXosis. — A medium sized species with ovoidal, deeply constricted l)ody, 

 its length 1.33 transdiameters; girdle without dis})lacement ; sulcus extending 

 from girdle to antapex; surface ridged; color, green. Length, 80/*. Arctic 

 Ocean, July. 



