24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. S2 



hook. The second basipod of the left foot has the long curved 

 projection of the genus, but it is longer and slenderer than in the 

 other species. The first segment of the exopod is longer and nar- 

 rower than the second basipod. The second segment of the exopod 

 has a broad rounded end armed with two small spines. 



Length : Female, 1.5 mm : male, 1.2 mm. 



Found in Lake Baikal, Asia. 



The preceding description is from the original account by Sars. 



EPISCHURA CHANKENSIS Rylov 



Plate 10, Figures 1, 2 



Epischura chankemis Rylov, 1928, p. 126. tigs. 1-12 ; 1930, p. 260, fig. 86. 1-3 ; 

 fig. 87, 1 and 2 ; fig. 88, 1-4. 



E. chankensis resembles E. haikalensis very closely but differs in 

 the following particulars: 



In the female the lateral wings of the last cephalothoracic seg- 

 ment are shorter and do not so distinctly project backward. The 

 branches of the furca are asymmetric. The hyaline abdominal plate 

 is larger than in E. haikalensis. The last segment of the exopod of 

 the fifth foot (pi. 10, fig. 2) is shorter than in E. haikalensis and is 

 armed with three rather stout spines, which are practically terminal. 



In the right fifth foot of the male (pi. 10, fig. 1) the internal proc- 

 ess of the second basipod is much longer than in E. haikalensis., and 

 the hook of the terminal segment is irregularly curved. The termi- 

 nal segment of the left foot is shorter than in E. haikalensis and 

 armed at the end with a bunch of cilia. 



Occurrence. — This species was found in Lake Chanka, about 200 

 kilometers north of Vladivostok. 



DOUBTFUL SPECIES 

 Epischuea FLTjviATrLis Herrick, 1883 



This species was reported by Herrick and has not been seen since. 

 If his figures are correct, it is not an Epischura. and the suggestion 

 of a new genus, Lamellipodia^ by Schmeil is justified. As there are 

 inconsistencies in Herrick's description, however, and as the form 

 has been found by no one else, it seems better to consider this a 

 doubtful species. Schacht has given a very full discussion of the 

 subject, and it does not seem necessary to repeat it here. 



Epischxira massachusettsensis Pearse, 1906 



It is impossible to decide whether this is a new species or an im- 

 perfect description of one of those already recognized. Only females 

 were found and the fi2;ures were of the abdomen and fifth foot. The 



