CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 97 



base. Ambulator}' feet smootb, scarcely at all hairy; meros with a 

 small spine near its superior extremity. 



The color in life is bluish-gray with darker mottlings ; below white. 

 Dimensions of the carapax in a male: Length, 0.31 ; breadth between 

 tips of orbital angles or teeth, 0.52 inch. 



This crab, like some of its congeners, feigns death when caught, 

 remaining perfectly quiescent, with its feet outstretched, as if in 

 asphyxia. 



It is found on mud bottoms, in 6 fathoms, in the bays near Hong- 

 kong. 



152. MACROPHTHALMUS CONVEXUS Stimpson 



Plate XIII, Fig. 2 



Macroplitliahnus convexus Stimpson, Proc. Acad. Nat. Sci. Phila., x, 

 p. 97 [43], 1858. 



Carapax broadest at the external angles of the orbits, convex, 

 especially posteriorly; length to breadth as i : 1.74. Surface smooth 

 and glossy, except toward the lateral margins, where it is somewhat 

 granulose. Regions distinct. Two granulous protuberances in a 

 longitudinal line on the branchial region near the postero-lateral 

 corners of the carapax. Sides crested, with two emarginations an- 

 teriorly, the posterior one inconspicuous. Tooth forming the angle 

 of the orbit sharply prominent. Orbits somewhat oblique ; inferior 

 margin serrated. Hands and fingers pilose within. The fingers 

 each bear a tooth on the inner margin near the base, as in M. paciH- 

 cus. Ambulatory feet smooth ; tooth near summit of meros very 

 small. Male organs long and slender. 



Dimensions of the male specimen, which is perhaps immature : 

 Length of carapax, 0.34 ; breadth, 0.59 inch. 



Found at Loo Choo. 



153. MACROPHTHALMUS PACIFICUS Dana 



Macrophthahmis pacificus Dana, U. S. Exploring Expedition. Crust., i, 

 314, pi. XIX, fig. 4. 



Found at Loo Choo. 



Genus CH^NOSTOMA Stimpson 



The chief character of the genus CIcistostonia. as understood by 

 Dana, is found in the large relative size of the meros-joint of the ex- 

 ternal maxillipeds, which nearly equals the ischium in length. Li 



