i 
ENTOMOSTRACA OF MINNESOTA. 335 
figure of (C. tessellata (Trans. Linn. Soc., v. 26, Pl. 23, Fig. 39), but this 
species is longer in proportion to height and has the highest point of 
the dorsal margin a little farther behind. Ventral margin very 
slightly emarginate. In dorsal and ventral view somewhat resembling 
Brady’s figure of Macrocypris minna (loc. cit., Pl. 28, Fig. 34). Right 
[? left] slightly overlapping the left [? right]; surface smooth, with 
minute punctures and short hairs, but with a group of scattered, large 
sordid, yellowish punctures about the middle of each valve. Color 
bluish-white (nearly that of thin milk), though some specimens show 
a decided pale greenish tinge. Basal joint of superior antenn with 
two short sete above and one below; second joint with a single short 
one below; third with two short unequal setze above and one below; 
fourth with two above like those of the third, and two long ones below; 
fifth as the fourth; sixth with the two upper sete as in the third and 
fourth, but with four long ones below; seventh with two long and two 
shorter sete. Inferior antenne with one moderately long and two 
short claws, and two sete from the end of the last joint, and with four 
long claws (one shorter than the other three), and one moderately long 
Seta, and one long one from the end of the penultimate joint, besides 
four rather long ones above, and two beneath about its middle. Third 
joint with the usual single stout seta from its end beneath, and the 
usual fascicle of five long and one short one above near the end, and 
the usual articulated process. Post-abdominal ramus similar to that of 
C. incongruens as figured by Brady (loe. cit., Pl. 23, Fig. 20), but longer, 
having three unequal setie, the terminal one longest. Seminal gland 
very Similar to that of Notodromas monachus (loe. cit., Pl. 37, Fig. 36). 
Length + of an inch; height -;';; greatest thickness ;. Probably the 
largest known species of the genus. It is abundant in the ponds along 
the upper Arkansas river in the Mount Harvard region, at an altitude 
of about 8,000 feet. When first taken, my specimens were brownish 
from adhering mud, but alcoholic specimens have the livid white color 
above mentioned. The lucid spots are indistinct and difficult to make 
out; there are about nine, the two anterior obliquely transverse and 
long, the two posterior small.’’ (V. T. Chambers. ) 
Habitat: Upper Arkansas river in Mount Harvard region. (V.T. 
Chambers. ) 
FAMILY DARWINULIDE. 
‘‘Antenne destitute of swimming sete and of poison gland and 
duct. Mandible-palp three-jointed; the basal joint large and densely 
setiferous. Two pairs of jaws, the first bearing a large branchial 
plate, the second a smaller branchial plate and a pediform palp. Two 
pairs of feet external to the valves. Post-abdominal lobes sub-conical, 
small.”’ (Brady and Norman. ) 
