296 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
In both males and females the antenne are six-jointed. The nata- 
tory sete extend to beyond the tips of the terminal claws. 
There is no branchial plate on the second maxilla. The palp of 
this jaw is two-jointed. In the female the distal joint is short and 
cylindrical, bearing at its apex two short sete; in the male the distal 
joint forms a long scythe-shaped appendage. 
The second foot is five jointed, terminating in three sete, two of 
which are directed backwards. 
The two eyes are not confluent. 
The abdominal rami are long and slender. Males are numerous. 
The cylindrical core of Zenker’s organ (verticillate sac) is ornamented 
with numerous closely set whorls of short stout spines. 
Notodromas monacha (O. F. Miller). 
PLATE LXXII, Fie. 4-45. 
1785.—Cypris monacha O. F. Miller (149), p. 60, Taf. V, Figs 6-8. 
1820.—Monoculus monachus, Jurine (98), p. 173, Pl. XVIII, Figs. 13-14. 
1837.—Cypris variabilis Koch (102), H. 10, 3. 
1837.— ‘‘  lencomela Koch (102), H. 10, 4. 
1837.— ‘* monacha Koch (102), H. 11, 1. 
1837.— ‘*  bimuricata Koch (102), H. 11, 2. 
1837.— ‘‘ nubilosa Koch (102), H. 12, 4. 
1814.— ‘* monacha Zaddach (234), p. 31. 
1850.— ‘‘ monacha Baird (2), p. 153; Pl. IV, Figs. 1-11. 
1851.— ‘‘ monacha Fischer (64), p. 146. 
1853.—Notodroma monachus Lilljeborg (118), p. 95; Taf. VIII, Figs. 1-25; Taf. XII, 
Figs. 13; Taf. XXV, Fig. 16. 
1854.—Cyprois monacha Zenker (233), p. 80; Pl. III, C. 
1868.— ‘ monacha Plateau (169), p. 60; Pl. I, Figs. 22-23. 
1868.—Nolodromas monachus Brady (18), p. 379; Pl. XXIII, Figs. 1-9; Pl. 
XXXVIL Fig. 3. 
1870.—Notodromas monachus Heller (81), p. 78. 
1872.—Cypris monacha Fric (69), p. 228. 
1880.—Notodromas monachus Robertson (184), p. 22. 
1882.— st monachus Herrick (85), p. 252. 
1885.— © monachus Nordquist (155), Pls. I, I] and IV. 
1887.— es monachus Korschagen (104), p. 24. 
1888.—Cyprois monacha Schwarz (199), p. 11. 
1889.—Notodromas monacha Brady & Norman (31), p. 96. 
1891.— oy monacha Wenzel Vavra (221), pp. 32-39; Figs. 7 9. 
This species does not seem to be as abundant in America as in 
Europe. I have never encountered it. The figures that accompany 
this description are Professor Herrick’s (86), and the following diag- 
nosis is due to Professor Brady (18): 
‘“MaLp.—Carapace obliquely sub-quadrangular, greatest height 
equal to two thirds of the length, situated in the middle. Anterior 
