ENTOMOSTRACA OF MINNESOTA. 321 
The feebly-curved post-abdomen (Fig. 46) is stout and short. The 
terminal claw is a little more than half as long as the abdominal 
ramus. The adjacent claw is about three-fourths as long as the ter- 
minal claw. 
Habitat: Cincinnati, Ohio (Turner, 213); Guanajuata, Mexico 
(Herrick, 86); Albuquerque, New Mexico. 
Cypris virens Jurine. 
PLATE LXXIV, Fias. 3-3e. 
1820.— Monoculus virens Jurine (98), p. 174; Pl. XVIII, Figs. 15-16. 
1838.—Cypris qibberala Koch (102), H. X XI, 20. 
1844.— ‘‘  virens Zaddach (234), p. 35. 
1844.— ‘‘ pilosa Zaddach (234), p. 36. 
1850.— ‘‘  ¢ristriata Baird (5), p. 152; Taf. XVIII, Figs. 1, 1a-1i, 2-3. 
1851.— ‘‘  ornataS. Fischer (63), p. 157; Pl. IX, Figs. 7-10. 
1853.— ‘‘  virens Lilljeborg (118), p. 117; Taf. VIII, Fig. 16; Taf. IX, Figs. 4-5. 
1868.— ‘‘  virens Brady (18), p. 364; Pl. XXIII, Figs. 23-32; Pl. XXXVI, Fig. 1. 
1868.— ‘‘ pubera Fric and Nekut (70), p. 46, Fig. 26. 
1870.— ‘‘  ventricosa Brady and Robertson (33), p. 12; Pl. IV, Figs. 1-3. 
1872.— ‘* pubera Fric (69), p. 226. 
1874.— ‘*  virens Brady, Crosskey and Robertson (30), p. 124; Pl. II, Hibs 27-28. 
1887.— ‘‘ Helena Moniez (135), p. 2. 
1887.— ‘*  virens C. L. Herrick (86), pp. 24-26; Pl. VI, Fig. 3. 
1889.— ‘‘  virens Brady and Norman (31), p. 77. 
1891.— ‘‘  virens Wenzel Vavra (221), pp. 102-104, Fig. 3; Figs. 4, 41, 47, 44; 
Figs. 5, 51-52; Figs. 36, 361-364. 
Only once have I encountered an American form which I supposed 
was Oypris virens. Then the specimens were accidentally destroyed 
before accurate drawings were made. Mr. Deming, however (Her- 
rick, 86), claims to have found this species to be quite abundant at 
Granville, Ohio. The following description is due to Mr. Deming. 
I have taken the liberty to omit much that is merely generic and to 
add, in brackets, some specific characters. 
‘*Valves sub-reniform, the two ends almost equal, the dorsal side 
evenly curved, the ventral side sinuated, highest in the middle. The 
valves are covered with minute hairs. The hinge-line is sinuated and 
unbroken. The outer part of the shell is slightly lined. The shell as 
seen on end is oval; seen from above, oblong-ovate. Lucid spots, 
about seven in number, are found in about the centre of the valves; 
these are oblong and irregular in shape, often pointing towards the 
ventral margin. Isolated spots are found near the dorsal side. The 
color is olive or yellowish green, with dark brown spots near the dorsal 
margin and scattered throughout the shell * * * * * * x 
[The two biarticulate spines on the first mandibular process of the 
first maxilla are smooth. ] 
