J^RA ALBIFRONS. 



ISOPODA. 



NOR MA LI A. 



317 



ASELLID^. 



J^RA ALBIFRONS. 



Specific character. Suhovate, very depressed, sides of tlie cepbalon, pereion, 

 and pleon margined. Colour cinereous, with the anterior margin of cephalon 

 whitish. 



Length, about one-sixth of an inch. 



Onisciis alhifrons. Montagu, MSS. in Brit. Mus. 



Jcera alhifrons. Leach, Edinb. Encycl. vii. p. 434. Trans. Linn. Soc. 



xi, p, 373. Suppl. Enc. Brit. i. 428. Samouelle, 



Ent. Compend. p. 110. Desmarest, Cons. p. 316. 



Milne Edwakds, Crust, iii. p. 150. W. Thompson, 



in Ann. Nat. Hist. xx. p. 245. White, B. M. Cat. 



Brit. Crust, p. 69. Pop. Hist. Brit. Crust, p. 231. 



GossE, Man. Mar. Zool. i. fig. 243. 

 Ja:ra nivalis ? Kroter, GriJnlands Amfipod. p. 75, pi. 4, fig. 21a — k. 



Milne Edwards, 0. C. p. 149. 

 Oniscm marinus'? 0. Fabricius, Fn. Grcenl. p. 252, n. 229. 



