146 LEUCOSIAD^E. 



minute but distinct tubercles ; the hand is somewhat 

 tumid, robust, and the fingers slightly grooved. The re- 

 maining feet slender, and little different from those of the 

 former species. The foot-jaws and other parts about the 

 mouth, as well as the whole surface, are nearly smooth. 

 The abdomen in the male is triangular, about twice as 

 long as it is broad, obsoletely carinated, the third, fourth, 

 and fifth joints united, the terminal one with a small promi- 

 nent point directed backwards. In the female the general 

 form of the abdomen much resembles that in E. Pennantii, 

 but the fourth, fifth, and sixth joints are united ; it is 

 distinctly carinated. 



Colour reddish white, the anterior margin and a few dots 

 on the carapace red, with indistinct reddish bands across 

 the abdomen in the female. 



Length half an inch ; breadth very little exceeding the 

 length. 



This species, which appears to be more rare than the 

 former one, although perhaps less so than E. Cranchii, was 

 first described and figured by Montagu, who at once ap- 

 preciated the distinction between it and Pennant's Cancer 

 tuberosus, and gives those distinctions with great discrimi- 

 nation. The carapace is more nearly rectangular ; the 

 whole surface nearly smooth, instead of being, as in the 

 former case, covered with distinct pearly granulations; 

 the three distinct tuberosities of the carapace, so different 

 from the cruciform elevation in E. Pennantii, the raised 

 margin, together with the different form and composition 

 of the abdomen, and the more swollen and uneven cha- 

 racter of the hands, form altogether an accumulation of 

 distinctive characters so obvious that it is impossible to 

 account for the two species being for a moment considered 

 as mere varieties, as they are by Dr. Milne Edwards. 



