CRUSTACEA NORTH PACIFIC KXPLORING EXPEDITION 12/ 



Typical examples of the species were taken abundantly on the 

 shores of the Straits of Sangar by Messrs. Brooks and Kern, and 

 by the officers of the "Hancock." 



211. HETEROGRAPSUS NUDUS ' (Dana) Stimpson 



Pseiidograpsiis nudiis Dana, U. S. Expl. Exped., Crust., i, 335, pi. xx, 

 fig. 7. Stimpson, Pacific Coast N. A., Crust., p. 29. 



Heterograpsus marmoratus Milne Edwards, Mel. Carcin., p. 159. 



Heterograpsus nudus Stimpson, Proc. Acad. Nat. Sci. Phila.. x, p. 104 

 [50], 1858. 



Found about the entrance of San Francisco Bay, among- rocks and 

 stones, not far below high-water mark. 



Genus PSEUDOGRAPSUS ^lilne Edwards 



212. PSEUDOGRAPSUS ALBUS Stimpson 



Pseiidograpsus albiis Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 104 

 [50], 1858. 



Small ; carapax much flattened, smooth and glossy ; proportion of 

 length to breadth, i : 1.14. Epigastric lobules distinct. Posterior 

 cardiac region defined. Front broad, depressed, nearly horizontal. 

 Frontal margin thickened, straight or slightly convex, sufficiently 

 projecting. Antero-lateral margin with two slight emarginations 

 behind the angle of the orbit, indicating three minute teeth. Exter- 

 nal maxillipeds with the external angle of the meros-joint dilated 

 and rounded. Chelipeds short, smooth, and glossy ; inner angle of 

 carpus prominent, acute ; hand smooth on both sides, palm much 

 shorter than the carpus ; a tuft of short hair on the outside between 

 the bases of the fingers. Ambulatory feet flattened, smooth, with 

 neither granules nor spines on any part ; penult and terminal joints 

 somewhat hairy below ; dactyli tapering, sulcated. Abdomen of the 

 male rather narrow, tapering; penult joint subpcntagonal, terminal 

 joint ()l)long. 



Color white, with a few scattered grayish dots and punctae. Dimen- 

 sions of a male: Length of carapax, 0.27; breadth, 0.282 inch. 



Found under stones above low-water mark, on gravel, in a small 

 harlmr on tlic southern side of Kikaisima. 



^ Hcmigrapsus nudus (Dana) 



