302 GEOLOGICAL SURVEY OF THE TERRITORIES. 
3, d) in the front being thicker, the truncated end forming, seen from 
the end, a much less flattened triangle. 
First antenne much stouter thanin Z. gouldit. Second antenne con- 
siderably longer than in L. gouldti, the terminal joint extending well 
beyond the end of the front, while in Z. 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 antenne.) 
In form the antenne resemble those of L. gouldii, 
but the sete 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 LD. gouldii or 
LL. mucronatus, the claw 
(Plate XX VII, fig. 3, en®) 
is shorter, but the finger 
(en? should be en?) is 
much larger than in the | 
foregoing species. The G9 
jaw-like coxal lobe is 
larger than in LZ. gouldi 
or L. mucronatus. The | 
gill is enormous, as 1s also ( 
the flabellum (br'), the 
two being of the same 
Fic. 5.—Limnetis brevi- oz B > 4 Fic. 6.—Limnetis brevifrons, a, out- 
Frons, frontof female, great- size and half as long as line of shell; b, front of head of female. 
ly enlarged. Lindahl del. the entire limb, while the Lindahl del. 
lower division of the flabellum, that next to the hand, is rather broader 
and larger than in ZL. gould. In the female the upper division of the 
flabellum (br') isshort and broad ; the gillis very long; the lower division 
of the flabellum (Plate XX VII, fig. 2 a) is as in LZ. 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, 34™™. 
Several larger examples were 6™™ long and 5™™ broad. 
Hillis, Kans., June-28 and 29, Dr. L. Watson, in pools, associated with 
several other species of Phyllopods.. A few eggs were contained in 
inost 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. 
LIMNETIS GRACILICORNIS Packard. 
Limnetis gracilicornis Packard. Amer. Jour. Se., 3d ser., vol. ii, Aug., 1871. 
This species differs from L. gouldit in the longer and slenderer 2d an. 
tenne, the flagella of which are 20-jomted; the keel on the front of the 
head does not reach to the front edge, while in L. gouldi it does. (Fig. 
3, b.) Shell of the same form, but much larger than in L. gouldit. 
Length of shell, 4.2™™; breadth, 4™™. 
Waco, Tex., with Hulimnadia texana and Streptocephalus texanus (G. 
W. Belfrage). I have unfortunately been unable within late years to 
obtain any specimens for dissection and study. 
