found on the South Coast of Devonshire. 87 



thorax are globose ; whereas the other has a longitudinal angu- 

 lated ridge, intersected by a transverse one that forms a cross*: 

 the legs and arms of this species are shorter, and the latter more 

 uneven ; the fangs shorter, and neither turned inwards nor an- 

 gulated as in the other: the smooth rcflexed margin of the tho- 

 rax is also a strong character in this species. 



Whether the C. tuberosus was originally taken at Weymouth is 

 not mentioned ; but Mr. Pennant took his description from one 

 in the Portland cabinet. The C. tumefactus was taken at that 

 place by Mr. Bryer, who kindly favoured me with it. 



Cancer denticulatus. 

 Tab. II. Fig. 3. 



Thorax broad before, narrow behind, rugged with spines and 

 tubercles, the margin continued in one series of sub-serrated 

 denticulations: the front between the eyes is quinquedentate, the 

 middle spine the longest: the sides are also quinquedentate, be- 

 sides a small process over each eye: eyes prominent: antennee 

 obscure: the arms not longer than the body, angulated, or 

 ridged longitudinally, with blunt spines at the top of the mid- 

 dle joint; fangs angulated and denticulated; the legs are also 

 angulated; claws subulate: tail narrow, regularly tapering. 



Length three quarters of an inch; breadth rather more. 



This singular species of crab was sent to me, amongst a va- 

 riety of British Cancri, by my late worthy friend Mr. Boys, as 

 the produce of the coast of Sandwich. The living colour could 



* I have taken several specimens of Cancer tulerosus of both sexes, which differ in 

 nothing but the size of the tail ,♦ and therefore these two crabs cannot be considered 

 as possessing only sexual distinction, 



not 



