of the Pacific Shores of North America. 487 
chiefly the anterior one, while it is smooth in the middle ;— 
in our species it is generally everywhere rugose, except at 
the postero-inferior wings, and much more so anteriorly 
than in the other species. In female individuals of equal 
length, the terminal segment of the abdomen is one sixth 
longer in H. talpoidea than in H. analoga. Finally there are 
slight differences in the details of the feet and antenne, not 
as well marked, however, nor as constant as those of the 
carapax, One of the most prominent of these is in the 
spines of the acicle or appendicular scale of the outer anten- 
ne, which in our species are somewhat longer, more slender, 
and more curved, than in the eastern one. 
Compared with H: emerita, the teeth of the frontal mar- 
gin of the carapax are found to be much less acute than in 
that species ; the spines of the acicle are not as long, and 
are curved inward instead of outward. 
It is of a bluish or cinereous color above, and yellowish- 
white below; the fringing hairs are mostly black. The 
dimensions of a female specimen from Tomales Bay are 
as follows: length of carapax, 1.19; breadth, 0.91. 
It inhabits sandy beaches on the open coast. 
Hab. Tomales Bay, (Samuels;) near San Francisco, 
— e ; Monterey, (Taylor;) and Mazatlan, (Ver- 
reaux. 
Mus. Bost. Soc.; Phil Acad.; Smithsonian; Paris; 
Acad. Petrop. 
Trine GALATHEIDEA. 
GRIMOTEA GREGARIA. Leach. 
Grimotea gregaria, LEACH ; Dict. des Sci. Nat. xviii. 50. OwEN; Zool. of 
s à -P.87. See figure in Daxa's Report on the Crustacea of the 
Xploring Expedition, Atlas, Pl. XXXI. f. 1. 
À pelagie species, found swimming at the surface off the 
Coast of California by the naturalists of the “ Blossom.” 
Mus. Zoil. Soc. of London. 
