11YAS AKANEUS. 



31 



DEC APOD A. 

 BRACHYUn.l. 



MATADM. 



Hyas araneus. 



Specific cliaracter. Carapace not contracted behind the post-orbitar hastiform 

 process. 



Cancer araneus, 



Bufo, 

 Tnachus araneus, 



Hyas 



LINN. Syst. Nat. I. 1044. 

 HERUST, I. t. xvii. f. 59. p. 342. 

 FABR. Ent. Syst. Suppl. 356. 

 LEACH, Edinb. Encycl. VII. 394. 



Id. 1. c. p. 431. Id. Malac. Brit. t. xxi. A. EDW. Hist. 

 Crust. I. p. 312. COUCH, Cornish Fauna, p. 66. 



THIS is the largest British species of the family with the 

 exception of Maia Squinado. The carapace is of an elongate- 

 triangular form, the posterior margin very much rounded, 

 and the anterior portion considerably narrowed. The ros- 

 trum is triangular, its two lacinise nearly parallel at their 



