SS2. 



] 



an 



d Adjacc 



nt Wat 









6 V/ 



boat equal in length I 



:o the last 



: abdominal 



\ segment 



. The ante 



nncc ar, 



■ robu 





>ng,a 



ittaining the m 



iddle of 



the abdom 



en. "and < 



the antepenu 



Itimate 



joint 



Of tlu 











le-third the length c 







On j 



ill the swimmin 



g feet tb< 





nes of th< 



















■onglyan 



,1 sharply set 







Thr 













.piringlyp 









The 



inner ramus of 



the right 



leg of the 



fifth pai 





Uary ai 



id un. 



irmed 



















The 



third joint of 



the outer 



ramus of 



the fifth 



pair of legs 



in the i 



emale 



isdi^ 



than the whole ramus. 

 1 throughout. 



4. Diaptomus sanguineus Forbes. (PI. vin Figs. 1-7 and 13.) 



of Natural History, ] 

 alothorax in the female are bifid, and its dorsal out 



, within which one of the levator muscles of the al 

 lrgins of these feet are°nut hairy. 



(PL vin, Figs. 15, 16, 21-23, 25-27, and PI. l 



The abdomen has fi 

 right side as large 1 



