52 Crustacea and Echinodermata of the 



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 GAMBELII. Agassiz. 



Cambams Gambelii, Girard; Proc. Acad. Nat. Sci. Philad. 1852, vi. 90. 

 Astacus Gambelii, Agassiz ; Proc. Acad. Nat. Sci. Philad. 1853, vi. 375. 



This species may be distinguished by the partly pilose 

 upper surface of its chelae, 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 nigrescexs. Stimpson. 



A-iacus nigrcsccns, Stimpsoh : Proc. Bost. Soc. Nat, Hist. vi. 87. 



Rostrum 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 of body 3.10 inches 



" carapax 1-60 " 



Width of 83 " 



Length of rostrum .40 " 



" terminal of spine of rostrum . . . .15 " 



hand 1.25 " 



Width of " 45 " 



