CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 187 



prominent. Front little prominent, pubescent. Chelipecls granu- 

 lated, not sulcatecl ; larger granules sometimes obscurely arranged in 

 rows ; carpus much broader than long, ^^■ith its anterior margin con- 

 vex and pectinated with about eight small, equal spiniform teeth. 

 Fingers of the larger hand gaping and pubescent within. This spe- 

 cies is of a uniform cream color. Length of the carapax, 0.3 ; 

 breadth, 0.345 ; length of greater hand, 0.37 ; breadth, 0.225 inch. 



Found under stones on rocky ground in the third subregion of 

 the littoral zone, on the shore of Ly-i-moon passage, near Hongkong, 

 China. 



294. PACHYCHELES STEVENSII Stimpson 



Pi,.\TE XXIII, Fig. 6 



PacJixcliclcs stevensii Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 242 

 [80], 1858. 



Carapax broad-ovate, smooth, not areolated, in the middle glabrous 

 and punctate, at the sides slightly striated transversely, and an- 

 teriorly obsoletely granulated. Sinus of the posterior margin shal- 

 low, broadly rounded. Front sufficiently prominent, triangular, 

 slightly pubescent. Chelipeds robust, granulated. In the greater 

 cheliped the meros is transversely striated above ; the carpus broad 

 and granulated, the granules unequal, the larger ones being some- 

 times arranged in more or less regular longitudinal rows ; anterior 

 margin of the carpus three-toothed, the teeth being prominent, trun- 

 cated, and denticulated, and the inner tooth bifurcated; hand granu- 

 lated, granules of the margins very prominent and lobulated ; fingers 

 not gaping; immovable finger triangular, a little pubescent within at 

 the base ; dactylus with marginal granules less prominent than those 

 of the palm. In the smaller cheliped the anterior margin of the car- 

 pus is convex, prominent, and not deeply tridentate ; the hand is 

 longitudinally bisulcated on its upper surface, and the fingers are not 

 tomentose. The ambulatory feet are provided with stout, short 

 hairs ; dactyli robust, with curved, almost hook-like extremities. 

 Length of the carapax in the female, 0.5 ; breadth, 0.525 ; length of 

 greater hand, 0.64; breadth, 0.36 inch. 



Found on the west coast of Jesso by Capt. li. K. Stevens, of the 

 steamer "J. Hancock." 



Cl-iius PORCELLAXA Lamarck restricted 



W'c have restricted the name PorccUana to that grouj) which in- 

 cludes most of the old Lamarckian species, and of which P. platy- 

 chcJcs mav he considered the type. The carapax is grnerallv longer 



