ENTOMOSTRACA OF MINNESOTA. 329 



was first encountered, it was supposed to be a Cypridopsis. While 

 working at its anatomy a specimen with the markings characteristic 

 of Cypris herricJci was discovered. This led to an investigation of the 

 larval history of the crustacean. 



These facts give us a very strong hint that the genus Cypris has 

 been evolved directly from the genus Cypridopsis. Should future 

 research show that all members of the genus Cypris have a Cypridopsis 

 stage, the discovery would give much weight to the hint. And if, at 

 the same time, the internal structure should prove to be similar, the 

 evidence would be conclusive. 



Cypris (?) albuquerquensis sp. n. 

 Plate LXXVIII. 



Length 0.5 mm. Height 0.28 mm. Width 0.35 mm. 



This is a small greenish hirsute shell abont twice as long as high 

 and much wider than high. 



Viewed from the side (Fig. 1) it is sub-reniforra. The two extremi- 

 ties are rounded, but the cephalic is broader than the caudal. The 

 dorsal margin is convex, the ventral nearly straight. 



Viewed from above (Fig. 2) the shell is a broad oval, widest near 

 the middle. The cephalic extremity is a trifle narrower than the 

 caudal. Hingeline straight. 



The terminal claws of the antenna are long, slender and non-pecti- 

 nate. The natatory sette on the antepenultimate joint do not extend 

 beyond the tip of the terminal claws. 



The feet are stout. 



For details consult Plate LXXVIII, Figs. 1-7. 



This species has not been encountered by the author. The descrip- 

 tion is based on drawings furnished by Professor C. L. Herrick. 



Habitat: Albuquerque, Xew Mexico. 



The data at my disposal render it impossible for me to rightly 

 classify or characterize the following species: C. agilis Haldeman (78), 

 G. discolor Haldeman (78), C. scabra Haldeman (78), C. simplex Hal- 

 deman (78), C. vitrea Haldeman (78), C. hispida De Kay (58). 



GENUS CYPRINOTUS Brady. 1885. 



This genus was first established by Professor Brady (26) in 1885 to 

 include a peculiar form that had been discovered by Mr. A. Haly in 

 Ceylon. Professor Sars (195) in 1889 amended the genus in such a 

 way as to make it include all the sexually propagated forms of the old 

 genus Cypris. In this paper Professor Sars' description has been 



