COPEPODA 



769 



56 (48, 63) Right endopodite of fifth foot of male distinctly longer than first 

 segment of exopodite 57 



57 (60) Second segment of right exopodite of male fifth foot has oblique 

 ridge on posterior surface 58 



58 (59) First segment of right exopodite of male fifth foot has transverse 

 ridge on the posterior surface. 



Diaptomus asymmetricus Marsh 1907. 



In the male fifth foot the lateral 

 spine of the terminal segment is 

 about one-half as long as the seg- 

 ment; the first segment of the female 

 abdomen has a prominent swelling on 

 the right side. Found in Cuba. 



Length of female, 1.39 mm. 



Length of male, 1.16 mm. 



FlG. 1201. Diaptomus asymmetricus. A, fifth feet of 

 male. X 103. B,. abdomen of female. X 70. 

 (Original.) 



59 (58) First segment of right exopodite of male fifth foot has two curved 

 processes on posterior surface. 



Diaptomus dor sails Marsh 1907. 



In the male fifth foot the lateral 

 spine of the terminal segment equals 

 or exceeds in length the segment; the 

 fifth cephalothoracic segment of the 

 female is armed with two dorsal 

 processes. Found in Louisiana and 

 Florida and probably in other states 

 bordering on the Gulf of Mexico. 



Length of female, 1.13 mm. 



Length of male, 1.069 mm. 



FIG. 1202. Diaptomus dorsalis. A, fifth feet of male. X 

 B, profile dorsal surface of cephalothorax of female. X 

 (Original.) 



