60 GENUS CANCER. 



cq lal, with four or five elevated, granulated lines on the outer 

 side, two of which are continued upon the finger, finger 

 somewhat defiexed and with the thumb brown or black at 

 tip, and furnished with regular crenate teeth; terminal ab- 

 dominal segment triangular, acute at tip. 



Length one inch and a half, breadth two inches and 

 three tenths. 



The female differs from the male in some respects so 

 particularly that it would be easy to mistake her for a 

 distinct species; to prevent this confusion it is proper in 

 this place to point out the differences. The thorax of the 

 female in two specimens before me is destitute of the 

 white H mark and also of the curved lines of white dots; 

 but the most striking dissimilarity is in the form of the 

 lateral teeth of the thorax, these are exactly of the same 

 number as in the other sex, but the form is different, each 

 one being divided at tip into several smaller tuberculous 

 teeth; the abdomen is but little dilated, it is also hairy; the 

 fingers are rather shorter and more of a deep black than 

 are those of the male. Whether or not it would be correct 

 to refer this species to C. undecemdentatus of Fab. and 

 Latr. is not to be positively determined from the very 

 concise description of that crab given by the latter author, 

 but certain it is, it approaches nearer to it than any other 

 \vith which I am acquainted, but differs from it, as far as 

 I can judge from the description, in not having the ^* tho- 

 rax rather dilated behind," neither are the ^^ handclaws 

 somewhat hairy." 



The exuvia of this species is often found on the sea 

 beach cast up by the waves. I have not seen the crabs in 

 bays or inlets, they appear to delight in deep water, and 



