86 Mr. Montagu's Description of several Marine Animah 



I have also been informed that it has been considered as the 

 C. orientalis, Herbst. tab. 20. Jig. 117; but if carefully compared 

 with that figure, it will be found that the thorax is not in the 

 least like, either in shape or markings, nor has that the dentated 

 margin : whereas Cancer Jioridus of the same author corresponds 

 in all those particulars. I cannot indeed quote Gmelin for this 

 crab with any degree of certainty, as he refers to different spe- 

 cies that are trilobated : it is however in all probability the Can- 

 cer Jioridus of Linnaeus. 



Cancer tumefactus. 

 Tab. II. Fig. 2. 



Thorax sub-rhomboidal, smooth, with a slightly reflected mar- 

 gin, and three round tumid elevations placed triangularly: snout 

 sub-bifid : antennae extremely small: eyes small, hidden within their 

 receptacles : arms short, sub-angulated, the edges uneven : hand 

 short, the outer margin carinated; claws short, toothed, the 

 thumb moderately hooked: legs eight, short, with subulate 

 claws. The tail of the female is very broad, and covers the 

 whole abdomen ; the joints are obscure, but appear to be four, 

 slightly ridged up the middle, with a depression on each side of 

 the ridge. 



Length three quarters of an inch ; breadth rather more. 



Colour pale dull yellow. 



The very great similitude in contour between this and Cancer 

 tttberosus of the British Zoology, might readily occasion their 

 being confounded without comparison : indeed the laconic descrip- 

 tion given by Pennant for his C. tuberosus might have induced 

 one to believe that it was intended for this, had not the figure be- 

 spoken the other. The material distinctions are, that this is 

 smooth, of a much paler colour, and that the inequalities on the 



thorax 



