322 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
‘“The post-abdomen forms two long, movable rami, which are well 
developed and terminated by two claws of unequal length, and in fine 
Specimens are serrated on their inner edge near the apex. The rami 
themselves are also serrated.”’ [In European specimens and in speci- 
mens taken by the present writer to belong to this species the abdomi- 
nal rami are not serrated. | 
Mr. Deming claims to have found the male of Cypris virens. I have 
reason, however, for supposing that he has confounded the males of 
some other species (perhaps C. crena) with Cypris virens. 
Habitat: Granville, Ohio (Herrick, 86). 
Cypris perelegans Herrick. 
PLATE LXXIII. 
1887.—Cypris perelegans C. L. Herrick (86), p. 27; Pl. III, Figs. 7-12. 
1894.—Cypris perelegans C. H. Turner (216). 
Length 3.60 mm. Height 1.72 mm. Width 1.40 mm. 
‘*Carapace of largest size, elongate sub-oblong, sides nearly parallel, 
upper margin nearly straight, lower outline with two sinuses and two 
slight convexities, produced to form a slight tooth behind; greatest 
height at one-fourth the length from the posterior, equal to less than 
half the length; width greatest somewhat in advance of the middle, 
about four-tenths the length; color clear, pale yellow, with a well-de- 
fined pattern in deep brown, pattern consisting of a sigmoid band 
crossing the middle of the valves, giving off spurs at each flexure, 
and sundry other spots, as well as an anterior marginal band; surface 
shining, minutely dotted, slightly hairy at margins; lucid spots con- 
sisting of two large irregularly pentagonal approximated spots, with 
three smaller ones grouped below; appendages very similar to C. virens; 
antenne seven-jointed, slender, basal segment very large, third 
elongated, four succeeding nearly equal in length, fourth and fifth 
segments each with two long sets above, sixth with four long and one 
shorter setee, apical segment with four very long sete, fifth segment 
with two sete of moderate length below; antennules (antennze) slender, 
apical segment with two serrate claws and two slender set, fourth 
(antepenult) segment the same, third segment with four long and two 
shorter sets, second segment with six long pectinate sete reaching to 
end of terminal claws; labrum with claw-like appendages bearing 
seven teeth, the inner being double, medianly the labrum appendaged 
with pectinate plates; the mandibles furnished with six strong teeth, 
two pectinate sete and several small spines, the palp being well-de- 
veloped; first maxilla with short lobes, the anterior of the one-jointed 
lobes with four very strong toothed spines; first foot with five seg- 
ments, the apical one being very small and bearing a single very long 
