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U ENTOMOSTRACA OF MINNESOTA. 323 
serrated claw, the third and fourth are equal and much more slender 
than the second; second foot slender, apical segment with two small 
claws and one delicate seta, caudal stylets elongated, narrow, serrate 
behind, with two straight, unequal serrate claws, lateral spine sub- 
terminal.’’ (Herrick, 86.) 
Habitat: Mobile, Ala. (Herrick 86.) 
Cypris altissimus Chambers. 
PLATE LXXIX, Fies. 10-13. 
_ 18—.—Cypris altissimus Chambers (41), pp. 152-153, Fig. 2. 
1887. —Cypris altissimus C. L. Herrick (86), v. 27. 
Length 1.26 mm. Height 0.63 mm. 
‘‘Valves oblong, slightly subreniform, highest about the middle, 
rounding regularly before and behind; the side view resembling some- 
what Baird’s figure of ©. tristriata, but less distinctly reniform, perhaps 
rather resembling in the form of the dorsal margin Cypridopsis vidua; 
it is, however, much more elongate in proportion to height. Brady’s 
figure of C. virens (= C. tristriata Baird) is alittle nearer to this species, 
but is too distinctly reniform. OC. virens also agrees with this species 
in the number (seven) of the lucid spots, and approaches it in their 
position on the shell, and in relation to each other, but they differ in 
shape. In this species, the extremities are more nearly equally 
rounded than in virens, the dorsal margin being evenly rounded before 
and behind the middle, and the ventral likewise, both before and be- 
hind the slight sinuation in the middle. But the anatomy of the ap- 
pendages differs more decidedly from that of virens, as will be seen by 
a comparison of the following account with Brady’s figures. Superior 
antenne with only twelve instead of fourteen long set, arranged as 
follows: There are two short sete (one longer than the other) from 
the third joint, which has none in Brady’s figure; two short and two 
long ones from the fourth joint, where virens has four long ones; three 
long ones and one shorter one from the fifth joint, which in virens has 
four long ones; four long ones from the sixth joint, where virens has 
only three, and three long ones and one short one from the last joint, 
where virens has three long ones. In the inferior antenne similar 
differences are found, and in the mandibular palpus even greater ones. 
The feet of the first pair appear to be identical in the two species, ex- 
cept that this species has a short seta on each of the joints three and 
four, which are not represented in Mr. Brady’s figure. His figure, 
however, shows one seta more on each of the joints two and three of 
the feet of the second pair than I find in this species, which likewise 
is much smaller than C. virens, being only one-twentieth of an inch 
long and one-fortieth high instead of one-fourteenth of an inch long and 
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