68 GENUS PINNOTHERES. 



tures minute, distant, an impressed, abbreviated, transverse 

 line near the middle; Clypeus sometimes perceptibly 

 cmarginate at tip; Sides of the thorax rounded, without 

 a margin or edge; Orbits rounded, eyes composed of 

 minute, red, approximate, punctures; hands clothed with 

 short white hairs, abrupth gibbous above the origin of the 

 th-imb; fingers hairy, rectilinear, shorter than the hand, 

 toothed at the base within, and terminated by an abrupt, 

 short, acute hook; pemiltimate joint of the first pair of 

 f'd^t d litde dilated. Abdomen as large as the thorax. 



Length seven twentieths of an inch, breadth two fifthni 

 of an inch, 



A very common inmate of the oyster of our markets, 

 and of more frequent occurrence in that variety called 

 Fresh Oldster, Though small, it is excellent food, and 

 those who eat oysters seldom reject it. Where the fresh 

 oyster is opened in considerable numbers, the crabs are 

 often collected and served apart, for the palates of the 

 luxurious. It is a curious fact, that although the female 

 of thit' species is so very often found occupying the Oys- 

 ter, the male is absolutely unknown. This is supposed, 

 by those who are not conversant with natural history, to be 

 the young of the common Crab (Liipa hastata.) 



2. P. dcpressiim. Thorax flat, rounded, somewhat 

 truncate behind, edged on each side by a raised line; cly- 

 peus advanced, truncate; penultimate joint of the feet dila- 

 ted; eyer. conspicuous. 



Inhabits the common Oyster? 



Thorax flat, polished, with a marginal raised line of 

 very short dense hair which is broader behind, straitened 

 ®ver the eyes and almost extinct on the clypeus; eyes pro- 



