310 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
GENUS CYCLOCYPRIS Brady & Norman. 1889. 
This genus, founded by Brady and Norman (31), has been amended 
by Wenzel Vavra (221). 
Antennules are seven-jointed. 
The antenne of the female are five-jointed; of the male, six-jointed. 
There is no olfactory organ on the fourth joint. Natatory sete are 
very long, reaching far beyond the tip of the terminal claws. The 
palp of the mandible and of the first maxilla normally developed. 
The second maxilla bears a branchial plate and a palp. In the 
female this palp is unjointed; in the male it forms a hooked prehensile 
organ. 
The last joint of the second foot is unusually long, being two-thirds 
as long as the fourth joint. 
Males are numerous. Zenker’s organ is similar to that of Cypria. 
The proximal side of its central cylinder is flat. Vas deferens is long 
and convoluted. The copulative organ is quadrangular. 
The abdominal ramus is robust, the caudal seta is situated at about 
one-third the length of the caudal border of the ramus from its distal 
extremity. 
Cyclocypris levis (O. F. Miiller.) 
PLATE LXX, Fias. 9-11. 
1785.—Cypris levis Miller (149), p. 52; Pl. III, Figs. 7-9. 
1820.—Monoculus ovwm Jurine (98), p. 179; Pl. XIX, Figs. 18, 19. 
1835.—Cypris minuta Baird (1), pp. 99; Pl. III, Fig. 9. 
1837.— ‘‘ brunnea Koch (102), H. X., Fig. 5. 
1837.— ‘* lepidula Koch (102), H. X. 6. 
1850.— ‘‘ minuta Baird (5), p. 155; Pl. XVIII, Figs. 7 and 8. 
1851.— ‘‘ pantherina Fischer (64), p. 163; PI. XI, Figs. 6-8. 
1853.— ‘* ovum Lilljeborg (118), p. 113; Pl. X, Figs. 13-15. 
1868.— ‘‘ ovum Brady (18), p. 373; Pl. XXIV, Figs. 31-34, 43-45; Pl. XXXVI, 
Fig. 8. 
1868.— ‘* ovum Claus (48), Pl. I, Figs. 1-5. 
1874.— ‘‘ ovum Brady, Crosskey & Robertson, (30), p. 125; Pl. I, Figs. 29, 31. 
1888.— ‘‘ ovum Schwarz (199), p. 18. 
1888.— ‘‘ ovum Sostaric (202), p. 46. 
1889.—Cypria levis Brady and Norman (31), p. 69. 
1891.— ‘* levis Wenzel Vavra (221), pp. 68-71, Figs. 21, 217-21. 
1894.— ‘* Jexvis C. H. Turner (215), pp. 14, 15; Pl. VII, Figs. 9-11. 
1894.— ‘S levis C. H. Turner (216). 
Length 0.51 mm. to 0.57 mm. Width about 0.4 mm. 
The somewhat translucent shell is hispid and very tumid, being 
about as broad as it is high. 
Viewed from above the shell is ovate with rounded extremities. 
The eye, which is situated near the cephalic extremity of the animal, 
is easily seen through the shell. 
