PACKARD.] PHYLLOPODS OF NORTH AMERICA. 299 
LIMNETIS GOULDII Baird. 
Plates II, Figs. 1-6; XXIX, Fig. 9. 
Limnetis gouldii Baird, Annals and Mag. Nat. Hist., 3d ser., vol. x, 393, 1862. 
Shell smooth, spherical, quite round, not often oval as in the two 
succeeding species, and of a uniformly smaller size. 1st antenne very 
slender, not so broad at the end as in L. brevifrons. 2d antenne with 
the stem longer and slenderer than 
in the two following species; the 
upper flagellum 16, the lower 16- 
jointed, with longer sete than in 
the other species. First leg of 
female with a very large, long, and 
broad flabellum (br’), the posterior 
division (br’’) very long and slen- 
der, closely resembling the 6th en- 
dite, but considerably longer; the PERS 
gill rather small. The coxal lobe se 
(1st endite) rather broad and not 
so long as in the two other species ; Uy ) 1} i 
the hand is much slenderer, and ““/////'] 
the claw (6th endite) a longer and Fic. 1.—Limmnetis gouldii, enlarged. Burgess del. 1st 
slenderer than in LZ. mucronatus ; antenne not drawn. 
in the male the coxal lobe is considerably smaller and more triangular 
and acute than in the two other species; the comb, or 4th endite ((*) is 
armed on the edge with an inner row of small and a marginal row of 
much larger digitate setiferous processes; the finger (1°) is of moderate 
size, and the claw-like 6th endite is long and slender; the flabellum (b7’) 
is about twice the size of the gill; and its posterior process (br’’) is 
long, narrow, extending only a little beyond the base of the 6th endite. 
The front in the male (Fig. 3 d, in text) is truncated, but contracts below 
the eyes more than in the other species; while the carina on the front 
of the head is unusually high. In the female the rostrum ends in a sharp 
point, with lateral acute angles much as in sharply mucronate specimens 
of L. mucronatus. 
Length of the shell, 3™™; breadth, 22™™. 
The species was first discovered in “fresh water at St. Ann’s, twenty 
miles from Montreal, Canada.” Collected by Charles Gould, esq., June, 
1857 (Brit. Mus., W. Baird). The young received from Hanover, N. H. 
Near Boston, Mass. (Edward Burgess); near Providence, R. L., in great 
abundance in a pond which dried up in midsummer, occurring during 
May, and for at least a month after Branchipus vernalis had disappeared 
from the pond (A. S. Packard, jr., and H. C. Bumpus); abundant in a 
pond at Glendale, Long Island, in March and April (Dr. C. F. Gissler); 
Normal, Ill. (S. A. Forbes); Rock Island, Ill. (W. H. Pratt, Davenport 
Academy). 
This is our most abundant species, and appears to range over New 
England, Canada, westward to the Mississippi River at Rock Island, 
Il. It is distinguished from the two other species by the more spher- 
ical shell, its smaller size, the rather narrow, contracted front of the 
male, and by the differences in the antennze and legs indicated in 
Plate I. 
We have kept these beautiful little phyllopods in confinement from 
early in May until the middle of July, with few changes of water; 
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