312 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
what smaller and a weak pectinate seta one-fifth the length of the 
stylet from the end; palp of mandible very bristly. The intromittant 
organ of the male is more simple than those hitherto described, con- 
sisting of a broad, flat basal segment on either side, with a coiled 
ductus ejaculatorius and a funnel-shaped terminal portion consisting 
of two opposable flaps. The basal segment is indistinctly two jointed 
and those of both sides are seated on a common prominence. 
‘‘Length of male 1.70 mm., of female 2.16 mm.; height of male 0.84 
mm., of female 1.24 mm. The above measurements are too large, but 
express the correct proportions. It is one of the smaller species.”’ 
Habitat: ? Alabama (Herrick, 86). 
GENUS CYPRIDOPSIS Brady. 1868. 
The antennule is seven-jointed. 
The antenna is five-jointed. The five natatory sete on the third 
joint are plumose. 
The branchia of the second maxilla consists either of a plate bear- 
ing five plumose sete or else of two setse which are inserted directly 
on the blade. 
The second foot is five-jointed and bears, near its extremity, a 
strong chitinous claw. 
The abdominal rami are rudimentary. 
The members of this species seem to be exclusively parthenogenetic. 
Cypridopsis vidua (0. F. Miller.) 
PLates LXXII, Fias. 1-lg; LX XV, Fias. 5, 6, 8, 9; LX XVI, Fias. 4, 7. 
1785.—Cypris vidua O. F. Miller (149), p. 55; Taf. IV, Figs. 7-9 
1820.—Monoculus vidwa Jurine (98), p. 175; Pl. XIX, Figs, 5-6. 
1837.—Cypris maculata Koch (102), H. 10, 2. 
1841.— ‘‘ — strigata Koch (102), H. 36, 19. 
1844.— ‘* vidua Zaddach (234), p. 35. 
1850.— ‘‘ vidua Baird (5), p. 152; Pl. XIX, Figs. 10-11. 
1850.— ‘‘ sella Baird (5), p. 158; Pl. XIX, Figs. 5, 5a. 
1851.— ‘‘ vidwa Fischer (64), p. 162; Taf. XI, Figs. 1-2. 
1853.— ‘  vidua Lilljeborg (118), p. 111. 
1854.— ‘ vidwa Zenker (238), p. 79. 
1868.—Cypridopsis vidua Brady (18), p. 375; Pl. XXIV, Figs. 27-36, 46. 
1868.—Cypris vidua Claus (48), Pl. I, Figs. 6-8. 
1868.— ‘‘ vidua Fric and Nekut (70), p. 48, Fig. 29. 
1869.— Cypridopsis obesa Brady and Robertson (32), p. 364; Pl. XVIII, Figs. 5-7. 
1870.— A obesa Brady and Robertson (33), p. 15. 
1870.—Cypris vidua Heller (81), p. 90. 
1872.— ‘‘ vidua Fric (69), 227. 
1874.—Cypridopsis obesa Brady, Crosskey and Robertson (30), p. 128; Pl. I, Figs. 1- 4. 
1879.—Cypris vidua C. L. Herrick (83), p. 112; Pl. XVII, Fig. 1. 
