492 Stimpson on the Crustacea and Echinodermata 
A species of Panulirus in the British Museum is said to 
have been brought from Sitka,—a very high latitude for 
this genus, if the locality is correct. It is catalogued as 
P. sulcatus, which is an East Indian species. 
ASTACUS GAMBELITI. Agassiz. 
Cambarus Gambelii, Grrarp ; Proc. Acad. Nat. Sci. Philad. 1852, vi. 90. 
Astacus Gambelii, AGass1z; Proc. Acad. Nat. Sci. Philad. 1853, vi. 375. 
This species may be distinguished by the partly pilose 
upper surface of its chele, and the convex serrated margins 
of its rostrum, which has no distinct antero-lateral teeth or 
angles. 
Hab. California, (Gambel.) 
Mus. Phil. Acad.; Smithsonian. 
ASTACUS NIGRESCENS. Stimpson. 
LJ 
Astacus nigrescens, SrrwPsox ; Proc. Bost. Soc. Nat. Hist. vi. 87. 
m concave above; margins nearly parallel, den- 
ticulated with five or six small sharp spines on either side. 
Thoracic spines of the anterior pair rather long ; a pair of 
minute spines between them and the posterior pair. Dorsal 
area between the branchial regions about as wide as.in 
A. Gambelii. Hands smaller and less broad than in the 
preceding species; surface without pubescence. The sides 
of the abdominal segments (lateral projections of the dorsal 
arch) are sharply triangular. Color blackish. The follow- 
ing are the dimensions of a male specimen :— 
length ol body ge ee ee inchet 
a carapax . : < . . Aina 1.60 à 
Width of  * : 83 
ebd mmm oe Ro ABO 
* terminal of spine of rostrum. + + i a 
T WM 1. VoL s s T 
Width of " : 
