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 altissinius Chambers. 



Plate LXXIX, Figs. 10-13. 



18 — . — Ct/pris aUisshnus Chamheis (41), pp. 152-153, Fig. 2. 

 1887.— Cypris aUisshnus C. L. Herrick (86), p. 27. 



Length 1.26 mm. Height 0.63 mm. 



"Valves oblong, slightlj^ subreniforra, highest about the middle, 

 rounding regularly before and behind; the side view resembling some- 

 what Baird's figure of C. trisirkita, but less distinctly reniform, perhaps 

 rather resembling in the form of the dorsal margin CypHdoims vidua', 

 it is, however, much more elongate in proportion to height. Brady's 

 figure of C. virens ( — (7. iristriata Baird) is a little nearer to this species, 

 but is too distinctly reniform. C. 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 cirens, as will be seen by 

 a comparison of the following account with Brady's figures. Superior 

 antennte with only twelve instead of fourteen long seta3, arranged as 

 follows: There are two short setic (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 antennae 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 G. virens, being only one-twentieth of an inch 

 long and one-fortieth high instead of one-fourteenth of an inch long and 

 21 



