310 GEOLOGICAL SURVEY OF THE TERRITORIES. 
ESTHERIA, JONESII Baird. 
Plates III, figs. 3, 5,7; XXIV, fig. 2; XXVIII, fig. 7. 
Estheria jonesi Baird, Proc. Zool. Soc. London, 147, Pl. XV, figs. 1, 1a, 1b, 1c, 1d, 1862. 
Packard, Hayden’s U. S. Geol. Surv. Terr. for 1873, 619, 1874. 
Shell very large, full, globose, nearly twice as thick as any of the pre- 
ceeding species} the beaks very large, full, and high, situated between 
the middle and the anterior third of the shell; dorsal edge short; shell 
donaciform or wedge-shaped. It also differs from all the other species 
in the very numerous crowded lines of growth, with a bead-like rim of 
coarse punctures just above each line; along the lower edge of the shell 
a rim of short stiff coarse sete. (Plate XXIV, fig. 2.) Seen from either 
end the shell is broad, heart-shaped. 
Second antenne stout, upper flagellum 18- the lower 17-jointed. In 
the first pair of legs of the male the gillis 
smaller than usual; the flabellum next to 
it is short and nearly twice as broad as in 
any of the other species, and the entire 
limb is short, and the hand also is short 
and stout, the claw being unusually short 
and thick. 
The telson is very short and highs. the 
Fic. 12.—Estheria jonesit, magnifea Upper edge with 13 pairs of coarse teeth 
twice. After Baird. of nearly uniform size; while a few hairs 
are on the basal half of the upper side of the caudal appendages. 
Length of shell, 14™™ ; height, 11™™; thickness, 8™™. 
Cuba (Dunker).—I am indebted for specimens to Dr. E. Von Martens, 
of the Berlin Museum. A number of specimens, which do not differ from 
‘the Cuban examples, were loaned me by Dr. Stimpson, curator of the 
Chicago Academy, and are marked ‘Locality lost.” As no other speci- 
mens from the West Indies occur in the collection received from Dr. 
Fie. 13.—Limnadia americana, Packard. 
Stimpson, it indicates that H. jonesiti may possibly oceur in the Southern 
States, or Central America; the only habitat as yet known being Cuba, 
where it is said by Baird to inhabit brackish water. 
