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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 herricki was discovered. This led to an investigation of the 
larval history of the crustacean. 
These facts give us avery 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 tothe 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 0.5mm. Height 0.28 mm. Width 0.35 mm. 
This is asmall greenish hirsute shell about twice as long as high 
and much wider than high. 
Viewed from the side (Fig. 1) it is sub-reniform. The two extremi- 
ties are rounded, but the cephalic is broader than the eaudal. The 
dorsal margin is convex, the ventral nearly straight. 
Viewed trom 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 sete on the antepenultimate joint do not extend 
beyond the tip of the terminal claws. 
The feet are stout. 
For details consult Plate LX XVIII, Figs. 1-7. 
This species has not been encountered by the author. The deserip- 
tion is based on drawings furnished by Professor C. L. Herrick. 
Habitat: Albuquerque, New Mexico. 
The data at my disposal render it impossible for me to rightly 
classify or characterize the following species: C. agilis Haldeman (78), 
C. discolor Haldeman (78), C. scabra Haldeman (78), C. simplex Hal- 
deman (78), ©. vitrea Haldeman (78), C. hispida De Kay (58). 
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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 
F: way as to make it include all the sexually propagated forms of the old 
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genus Cypris. In this paper Professor Sars’ description has been 
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