PORTUMNUS VARIEGATUS. 



85 



DECAPOD A. 



BKACHYURA 



PORTUNIDM. 



Portumnus variegatus. 



Specific character. Front tridentate ; carapace heart-shaped, not broader than 

 it is long ; terminal joint of the fifth pair of legs lanceolate. 



Cancer latipes, 

 Portumnus variegatus, 



Platyonyclius latipes, 



PENNANT, Brit. Zool. IV. t. i. f. 4. p. 5. 



LEACH, Edinb. Encycl. VII. p. 391. Make. Brit- 



t. iv. 

 EDWARDS, Hist. Crust. I. p. 436\ 



THE carapace of this species is almost evenly convex, 

 slightly granulated, heart-shaped, as broad as it is long, 

 the latero-anterior margins with the front almost continu- 

 ously arched, the latero-posterior margins much contracted. 

 There are four small teeth on each latero-anterior margin, 

 exclusive of the external angle of the orbit. The front 

 has three teeth, of which the middle one is the longest. 

 The orbits are entire, the superior and the inferior margin 

 regularly concave, with a strong tooth at the outer, and a 

 smaller one at the inner angle ; there is a considerable 

 hiatus at the inner canthus, which is filled with the basal 

 and second joints of the external antennae. The anterior 



