766 FRESH-WATER BIOLOGY 



45 (44) Process slightly exceeds in length penultimate segment, second 



basal segment of right fifth 

 foot of male not dilated on 

 inner margin, endopodite 

 of left fifth foot one-seg- 

 mented. 



Diaptomus franciscanus 

 Lilljeborg 1889. 



Found only near San Fran- 

 cisco. 



Length of female, 2.3 mm. 

 Length of male, 2 mm. 



FIG. 1195. Diaptomus jranciscanus, male. A, terminal 

 segments of right antenna. X 200. B, fifth feet. 

 X 200. (After De Guerne and Richard.) 



46 (43) Process shorter than penultimate segment 47 



47 (66) One or both terminal processes of last segment of left exopodite of 



male fifth foot distinctly falciform 48 



48 (56, 63) Right endopodite of fifth foot of male small, shorter than first 



segment of exopodite 49 



49 (53) Terminal segment of right exopodite of fifth foot of male elon- 



gate 50 



50 (51, 52) In fifth foot of male right endopodite rudimentary, left endopodite 

 two-segmented and spatulate in form. 



Diaptomus spatulocrenatus Pearse 1906. 



Found in New England. 

 Length of female, 1.52 mm. 

 Length of male, 1.31. 



FlG. 1196. Fifth feet of male Diaptomus spatulocrenatus. X 84. 

 (After Pearse.) 



