154 



BULLETIN UNITEP STATES GEOLOGICAL SURVEY. 



late appendage of the third joint has its apex swollen or enlarged. 

 Superior antennae with two long and one short seta from, the end of the 

 iburth joint; two from the end of the fifth joint; fonr long ones from 

 the end of the sixth; two long and two short from the end of the 

 seventh; (there are also other short setse on the different joints). The 

 last joint of the inferior antennee is small, almost radimentary, bearing a 

 single large claw. (Indeed, it seems to be bifid, with a claw from each 

 branch.) There are three other claws articulated to the end of the 

 penultimate joint, from which also arise four setse shorter than the 

 ■claws; two moderately long setse arise from about the middle of the 

 fourth joint above, and three longer ones below ; the usual fascicle of 

 five long and one short sette form the third joint, just behind which is 

 a bunch of short cilia and another bunch on the under side. Abdomi- 

 nal ramus straight, slender, with two claws one under the other. The 

 mandibular palpus, with branchial appendage and two large pulmose 

 and one simple setae from the end. 



Pond on Mount Elbert ; altitude about 11,000 feet. I took also, at 

 the same time and place, a single specimen resembling those above 

 described, but which I believe to be distinct ; but, having only one 

 example, I have not dissected it. It is smaller, narrows more rapidly 

 in front, and is of a grayish-white color. 



Baphnia hrevicauda n. sp. (Fig. 4). — Carapace thin and easily injured. 

 Animal sluggish, and very easily killed. Head forming a short, blunt 

 beak ; dorsal margin evenly arched to a point near the spine, where 

 the slope is much greater, and the posterior margin, both above and be- 

 low the spine, is sinuated, and armed with minute spines. Ventral mar- 

 gin convex, evenly rounded. The head is not distinctly marked off by a 

 suture in the carapace. The spine is nearer to the dorsal than to the 

 ventral margin, and is small and blunt. Superior antennae small ; inferior 

 very large, with plumose filaments. Carapace marked by very numerous, 

 fine, transversely oblique striae, hut not reticulated. In young specimens, 

 the spine continuous, or nearly so, with the dorsal margin, but it is re- 

 moved farther and farther from it as age increases. The largest speci- 

 mens exceed a little the largest of D. index, and the height is about two- 



FiG. 4. — Baplinia hrevicmida, Cham., u. sp. 



thirds the length. The color usually brownish-red ; the ventral portion 

 paler than the dorsal, and marked by about four alternate, rather iudis- 



