302 



GEOLOGICAL SURVEY OF THE TEERITOEIES. 



3, d) in the front being thicker, the truncated end forming, seen from 

 the end, a much less flattened triangle. 



First antenutTB much stouter than in L. gouldii. Second antennae con- 

 siderably longer than in L. gouldii, the terminal joint extending well 

 beyond the end of the front, while in L. gouldii it does not extend be- 

 yond the front ; the upper branch of the flagellum has 20 joints ; the 



lower, 20. (In L. gouldii there are 14 joints in the 



upper and 12 in the lower branch of the antennae.) 



In form the antennae resemble those of L. gouldii, 



but the setse are much shorter than in any of the 



other species. There are 12 pairs of feet. The 



male has a much smaller hand than in L. gouldii or 



L. mucronatus, the claw 



(Plate XXVII, fig. 3, en<') 



is shorter, but the finger 



{en^ should De en^) is 



much larger than in the 



foregoing species. The 



jaw-like coxal lobe is 



larger than in L. gouldii 



or L. mucronatus. The 



gill is enormous, as is also 



the flabellum (br^), the 



two being of the same 



01-70 cmn TiqI-F oc Inno- qq FlG. G.—Lirnnetis brevifrons, a, ont- 

 Size d.nu nd,ll dts lOIIg <ii, Imeof ahell; 6, front of head of female. 



the entire limb, while the Lindaw del. 

 lower division of the flabellum, that next to the hand, is rather broader 

 and larger than in L. gouldii. In the female the upper division of the 

 flabellum (6r^) is short and broad ; the gill is very long ; the lower division 

 of the flabellum (Plate XXVII, fig. 2 a) is as in L. mucronatus ; the 4th 

 endite is long and narrow, while the 5th is longer than the 6th. Terminal 

 segment less prominent than in L. mucronatus, while the dorsal edge is 

 less excurved. 



Average size of most of the specimens: Length, 4™™; breadth, 3^™™. 

 Several larger examples were 6""" long and 5™°' broad. 



Ellis, Kans., June 28 and 29, Dr. L. Watson, in pools, associated with 

 several other species of Phyllopods. A few eggs were contained in 

 most of them. This is the largest species known, and is as a rule flat- 

 ter and more triangular than any other species, while the truncate 

 front of the head of the male is shorter and broader than in any other 

 American species yet known. 



Fig. 5. — Limnetis hrevi- 

 frons, frontof female, great- 

 ly enlarged. Lindalil del. 



Limnetis gracilicornis Packard. 



Limnetis gracilieornis Packard. Amer. Jonr. Sc, 3d ser., vol. ii, Aug., 1871. 



This species difi'ers from L. gouldii in the longer and slenderer 2d an 

 tennae, the flagella of which are 20-jointed; the keel on the front of the 

 head does not reach to the front edge, while in L. gouldii it does. (Fig. 

 3, &,) Shell of the same form, but much larger than in L. gouldii. 



Length of shell, 4.2'""; breadth, 4™™. 



Waco, Tex., with Eulimnadia texana and StreiJtocepJialns texanus (G-. 

 W. Belfrage). I have unfortunately been unable within late years to 

 obtain any specimens for dissection and study. 



