CALIFORNIA STALK-EYED CRUSTACEA. 19 



Genus Oregonia Dana. 



Carapace flattened, riot spinose. Spines of rostrum long, slender, and 

 contiguous. Ambulatory legs of moderate length, the penultimate joint 

 similar to the preceding one, not dilated and compressed. Near Eurypodius. 



Type. 0. gracilis DANA. 



Oregonia gracilis Dana. 



Oregonia gracilis DAN A, Am. Jour. Sci. (2), Vol. XI, 1851, p. 270; Crust. U.S. 

 Expl. Expd., Part I, 1852, p. 106, PI. Ill, fig. 2. STIMPSON, Journ. 

 Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 456. BATE, in Lord's Natural- 

 ist in Vancouver's Island, Vol. II, 1866, p. 269. LOCKINGTON, Proc. Cal. 

 Acad. Sci., Vol. VII, 1877, p. 74. SMITH, Kept. Prog. Geol. Sur. Canada, 

 1878-9, B, p. 209. NEWCOMBE, Bull. Nat. Hist. Soc. Brit. Col., 1893, 

 p. 21. KATHBUN M., Proc. U. S. Nat. Mus., Vol. XVII, 1894, p, 59. 



Oregonia hirtaT>AKA, Am. Jouru. Sci. (2), Vol. XI, 1851, p. 270; Crust. U. S. 

 Expl. Expd., Part I, 1852, p. 107, PI. III., fig. 3. STIMPSON, 1. c., p. 

 456. LOCKIXGTON, 1. c., p. 75. WHITEAVES, Can. Nat. (2), Vol. VIII, 

 1878, p. 471. 



Oregonia longimana BATE, Proc. Zool. Soc. London, 1864, p. 663; Ann. 

 Nat. Hist. (3), Vol. XV, 1865, p. 487; in Lord's Nat. in Vancouver's 

 Is., Vol. II, 1866. 



Carapace subtriangular, more or less setose and roughened by minute 

 prominences. Median, cardiac, and branchial regions tumid. The rostral 

 horns may exceed the breadth of the interorbital space. Postorbital 

 spines slender, acute, inclined forwards, and situated some distance behind 

 the orbit. A prominence on the anterior side of the eye peduncle. The 

 septum separating the antennulary fossettes is produced into a spine. 

 Maxillipeds setose, the ischium produced forward into a rounded process 

 at the antero-internal angle. Chelipeds rather slender, the merus sub- 

 cylindrical and roughened with minute tubercles; carpus rounded; hand 

 long, slender, somewhat compressed, the margins obtuse; fingers slender, 

 smooth, incurved. Legs subcyliudrical and decreasing in length poste- 

 riorly; dactyls slightly exceeding one-half the length of the propodi and 

 terminated by long, corneous claws. 



Behring Sea to Oregon (Rathbun); Vancouver 

 Island (Bate, Smith); Puget Sound (Dana); northern 

 California! 



Like many other maioid crabs, this species varies 

 greatly as regards the development of the chelipeds in 



