174 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



Estlieria clarJcii Packard (Sixth Eeport Peab. Acad. Sc, 55, 1874). — 

 This species occurred in great abundance at Ellis, Kans., where it was 

 collected by Dr. L. Watson June 24-29, September 27, and October 10 

 and 22, 1874. While the carapace varies slightly from Kentucky speci- 

 mens, the body does not. 



Eulimnadia complexmianus, n. sp., 10 5 15 9 (Fig. 13, a — male hand; &, 

 end of body). — Carapace alikeinboth sexes, delicate, thin, smooth, in form 

 very closely allied to that of U. agassizii, the two species being nearly 

 identical in outline, though larger; fourteen or fifteen lines of growth, 

 while there are four in U. agassizii and five in U. texana; 

 the lines much more distinct than in either of these spe- 

 cies. The head differs from that of E. agassizii in being 

 full, and bulging out over the eyes, but in this respect is 

 like -2/. texana, though it is more retreating than in the 

 latter species. The pedunculated tubercle on the front of 

 the head is a little more produced than in JE. texana. The 

 antennae differ decidedly from those of the two other spe- 

 cies mentioned inthejoints being much shorter and broader, 

 with much shorter, stiffer hairs; flagellum with fifteen joints 

 .iM^'^-^oS^- ^^ ^^^^ branch. Twenty pairs of feet. 

 sTThand"^ eiTd M^alc hand long, and with a well-marked thumb-like pro- 

 of body; enlarged, cess about half as long as the claw which opposes it, and 

 which is much curved. Second pair of hands with the thumb bent at 

 right angles, opposing a slender forefinger like a claw ; a long, curved, 

 blunt, supplementary appendage arises from the base of the "forefinger". 

 Terminal segment alike in both sexes, larger than in the two other 

 species, and bulging more at base, where the two dorsal filaments arise. 

 The edge is much more finely spinulate than in U. texana, it being 

 coarsely spined in U. agassizii, while the terminal spine is very large, 

 nearly half as long as in the other species. The large ventral spine 

 is large, and broader at base, and tapers more rapidly than in the 

 two other species. It is not so long, in proportion to the terminal seg. 

 ment, as in _E/. agassizii, and is naked, not hairy, as in U. agassizii and 

 texana. Most of the females carried eggs, which were a little smaller 

 than those of E. agassizii. 

 Length of carapace, 7"°^; breadth, 5™"^. 



Ellis, Kans., in pools, June 24-29, 1874, associated with the other 

 Phyllopods from this locality. 



Thamnocephalus,* nov. gen. 



3Iale. — Olaspers (second antennae) with the basal joint short, the upper 

 forming a long, up-curved, chitinous, slender appendage, extending, 

 when outstretched, to the first third of the body ; the lower lobe fleshy 

 and short, straight. A distinguishing and remarkable character is the 



*9d/zvof, shrubby, bushy; /ce^aA^, head. 



