CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 187 



prominent. Front little prominent, pubescent. Chelipeds granu- 

 lated, not sulcated ; larger granules sometimes obscurely arranged in 

 rows ; carpus much broader than long, with 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 



Plate XXIII, Fig. 6 



Pachychelcs stevensii Stimpsont, 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. H. K. Stevens, of the 

 steamer "J. Hancock." 



Genus PORCELLANA Lamarck restricted 



We have restricted the name Porcellana to that group which in- 

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

 chclcs may be considered the type. The carapax is generally longer 



