CRUSTACEA NORTH PACIFIC EXPLORI\'G EXPEDITION 63 



is, however, as far as now known, exclusively. American, and the 

 oriental forms present certain distinctive characters which cannot 

 be regarded as otherwise than of generic importance. 



The carapax is generally like that of Panopeus^ the sharp, toothed 

 antero-lateral margin being shorter than the postero-lateral ; but the 

 front is deflexed, with the median lobes generally prominent. The 

 antero-lateral teeth are in general peculiarly cut, with convex sides ; 

 and they are often irregular in size. The hiatus of the infero- 

 exterior angle of the orbit is small and inconspicuous. The hecto- 

 g-nathopoda are generally not in contact along their inner margins ; ■ 

 and the ridge of the palate, defining the efferent canal, is sharply 

 prominent at the buccal margin. In the abdomen of the male the 

 joints are all distinct, the third, fourth, and fifth not being soldered, 

 as is usually the case in allied genera. 



This genus will include Panopeus deutatiis, P. caystriis, and P. 

 formio of Adams and White (Voy. Samarang, Crust., pp. 41, 42), 

 and the following new species. 



85. HETEROPANOPE GLABRA Stimpson 



Plate VIII, Fig. i 



Hcteropanope glabra Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 35 

 [ii], 1858. 



Carapax transverse; proportion of length to breadth, 1:1.55; 

 convex, broad anteriorly ; upper surface smooth ; frontal margin 

 straight, curving downward, not much projecting, and emarginated 

 at the middle. Antero-lateral margin five-toothed ; teeth small ; 

 angle of orbit minute, the next two teeth rounded, the last two sharp. 

 Eyes large. Orbit with a small hiatus at the external side beneath ; 

 upper and lower margins otherwise entire. Subhepatic regions 

 granulated. There is a thick fringe of hair on the inferior surface 

 of the carapax around the bases of the chelopoda. Surface of hecto- 

 gnathopoda, sternum, and abdomen pubescent. Chelopoda smooth ; 

 the right hand largest ; fingers much deflexed, crossing each other 

 at their tips. .Ambulatory feet slender, slightly hairy. 



Dimensions of a male : Length of carapax, 0.32 ; breadth, 0.495 

 inch. 



It has some resemblance to P. caystrus .\.dams and White, but the 

 teeth of the margin are more deeply cut than in that species. 



Found at Hongkong. 



