310 



GEOLOGICAL SUKVEY OF THE TEERITORIES. 



EsTHERiA JONESii Baird. 



Plates III, figs. 3, 5, 7; XXIV, fig. 2; XXVIII, fig. 7. 



Esihma jonesi Baird, Proc. Zool. Soc. London, 147, PL XV, figs. 1, la, 16, Ic, Id, 1862. 

 Packard, Hayden's U. S. Geol. Snrv. Terr, for 1873, 619, 1874. 



Shell very large, full, globose, nearly twice as thick as any of the pre- 

 ceding 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 iiuuctures just above each line; along the lower edge of the shell 

 a rim of short stiff coarse setse. (Plate XXIV, fig. 2.) Seen from either 

 end the shell is broad, heart-shaped. 



Second antennse stout, upper flagellum 18- the lower 17-jointed. In 



the first pair of legs of the male the gill is 

 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 high ; the 

 upper edge with 13 pairs of coarse teeth 

 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, IV"^ ; thickness, 8"°\ 

 Cuba (Dunker). — I am indebted for specimens to Dr. E. Yon 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. 



Fig. 12. — Usiheria jonesii, magnified 

 twice. After Baird. 



Fig. 13. — Linvnadia aniencana, Packard. 



Stimpson, it indicates that ^. jonesii may possibly occur in the Southern 

 States, or Central America; the only habitat as yet known being Cuba, 

 Avhere it is said by Baird to inhabit brackish water. 



