72 



CANCERIDJE, 



DEC APOD A. 

 BRACHYURA. 



CANCEEIDJE. 



Pirimela denticulata. 



Cancer denticulatus, 

 Pirimela, denticulata^ 



MONTAGU, Trans. Linn. Soc. IX. p. 87. t. ii. f. 2. 

 LEACH, Malac. Brit. t. iii. EDWARDS, Hist. Crust. 

 I. p. 424. 



THE general form of this pretty Crab will at once strike 

 us as differing very greatly from all those which have 

 preceded it. The carapace is very little broader than it 

 is long ; the anterior margin is so much arched, as to form 

 nearly a semicircle, whilst the posterior portion is regularly 

 and greatly narrowed. The latero-anterior margin is 

 armed with four prominent teeth, which are triangular, 

 slightly curved forwards and upwards, and flattened. The 

 front is tridentate ; the two external teeth are triangular, 

 flattened, curved a little upwards and inwards, and small ; 

 I have seen specimens in which they are almost obsolete ; 

 the middle tooth is spiniform, and considerably longer than 

 the others. The orbit is also furnished with similar teeth, 

 of which there are two above, the inner one being the 

 larger ; one beneath, and one at the external angle. The 



