770 



FRESH-WATER BIOLOGY 



60 (57) Second segment of right exopodite of fifth foot of male does not 



have oblique ridge on posterior surface 61 



61 (62) Lateral spine of terminal segment of right exopodite of male fifth 



foot terminal, endopodites distinctly two-segmented. 



Diaptomus bakeri Marsh 1907. 



In the female fifth foot the exopodites are 

 distinctly three-segmented, the endopodites 

 distinctly two-segmented. Found in Cali- 

 fornia. 



Length of female, 1.27 mm. 

 Length of male, 1.124 mm. 



Fig. 1203. Diaptomus hakeri. ^, fifth feet of male. 

 X no. 5, fifth foot of female. X 193. (Original.) 



62 (61) Lateral spine of terminal segment of right exopodite of male fifth 

 foot situated on distal third of segment, right endopodite 

 indistinctly two-segmented, left one-segmented. 



Diaptomus washingtonensis Marsh 1907. 



The first abdominal 

 segment of the female 

 has a digitiform process 

 on the right posterior 

 border. Found in 

 Washington. 



Length of female, 



1. 187 mm. 



Length of male, 



1.137 inro- 



Fig. 1204. Diaptomus washingtonensis. A, fifth feet of male. 

 B, abdomen of female. X 110. (OiigiBal.) 



Xia6. 



