Pacific Shores of North America. 55 



astacus oreganus. Randall. 



Astacus Oreganus, Randall; Jour. Acad. Nat. Sci. Philad. viii. 138. PI. VII. 



Eeichson ; Archiv fur Naturgeschichte, 1846, i. 375. 

 Cambarus Oreganus, Giraed; Proc. Acad. Nat. Sci. Philad. 1852, vi. 87. 



Dr. Randall's single specimen of this species was unfor- 

 tunately lost by the artist employed in delineating it. No 

 other example has since been found, although its locality 

 has been since repeatedly searched. If the figure in the 

 eighth volume of the Journal of the Philadelphia Academy 

 is correct, this is a very remarkable species, differing from all 

 others known, in possessing a median thoracic spine as well 

 as in the length of the terminal rostral tooth ; and above all in 

 the singular lateral appendages of the abdominal segments. 



Hab. Columbia River, (Nuttall.) 



nephrops occidentals. Randall. 



Ncphrops occidentalis, Randall ; Jour. Acad. Nat. Sci. Philad. viii. 139. 

 Gibbes ; Proc. Am. Assoc. 1850, p. 195. 



This curious lobster-like crustacean may be recognized 

 by the three rows of spines on the dorsal surface of the 

 carapax. It is a marine species, and grows to a length of 

 six inches. It was found on the " West Coast of America," 

 by Nuttall. The fine specimen in the cabinet of the 

 Philadelphia Academy is the only one yet known. 



Tribe CARIDEA. 



CRANGON FRANCIS CORUM. Stimpson. 



Plate XXII. f. 5. 



Crangon Franciscorum, Stimpson; Proc. Cal. Acad. Nat. Sci. 1856, i. 89. 



This species is more slender and depressed than is usual 

 in the genus. Rostrum small, subtriangular, rounded in 

 front. Spines of the thorax nearly as in C. vulgaris. Hand 



