COPEPODA 



769 



S6 (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 obhque 

 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 

 spine of the 

 about one-half 

 ment; the first 

 abdomen has a 

 the right side. 

 Length of 

 Length of 



fifth foot the lateral 

 terminal segment is 

 as long as the seg- 

 segment of the female 

 prominent swelling on 

 Found in Cuba, 

 female, 1.3Q mm. 

 male, 1.16 mm. 



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

 male. X 103. S, abdomen of female. X 79. 

 (Original.) 



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

 processes on posterior surface. 



Diaptomus dorsalis Marsh 1907. 



In the male fifth foot the lateral 

 spine of the terminal segment equals 

 or exceeds in length the segment; the 

 fifth cephalothoradc 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. I202. Diaptomus dorsalis. A, fifth feet of male. X I4S. 

 B, profile dorsal surface of cephalothorax of female. X 3»- 

 (Original.) 



