of the Pacific Shores of North America. 495 
ASTACUS OREGANUS. Randall. 
Astacus Oreganus, RANDALL; Jour. Acad. Nat. Sci. Philad. viii. 138, Pl. VII. 
Ertonson ; Archiv für Naturgeschichte, 1846, i. 375. 
Cambarus Oreganus, Grrarp; Proc. Acad. Nat. Sci. Philad. 1852, vi. 87. 
Dr. Ranpaw’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 OCCIDENTALIS. Randall. 
Nephrops 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 
“IX Inches, It was found on the “ West Coast of America,” 
by Nutrar. The fine specimen in the cabinet of the 
Philadelphia Academy is the only one yet known. 
Triss CARIDEA. 
CRANGON FRANCISCORUM. Stimpson. 
Plate XXII. f. 5. 
Crangon Franciscorum, Srimpson; Proc. Cal. Acad. Nat. Sci. 1856, i. 89. 
This species is more slender and depressed than is usual 
the genus. Rostrum small, subtriangular, rounded in 
Spines of the thorax nearly as in C. vulgaris. Hand 
in 
