IIYAS AKANEUS. 



31 



DEC APOD A. 



BRACHl'UBA. 



MAIAD/E. 



Hyas araneus. 



Specific character. — Carapace not contracted behind the post-orbitar liastiforra 

 process. 



Cancer araneus, Linn. Syst. Nat. I. 1044. 



„ Bufo, Herbst, I. t. xvii. f. 59. p. 342. 



hiachus araneus, Fabr. Ent. Syst. Suppl. 356. 



Maia ,, Leach, Edinb. Encycl. VIl. 394. 



Hyas „ Id. 1. c. p. 431. Id. Malac. Brit. t. xxi. A. Edw. Hist. 



Cnist. I. p. 312. Couch, Cornish Fauna, p. GG. 



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- 

 trmn is triangular, its two lacinia; nearly parallel at their 



