ISOPODA. 



NORMAL I A. 



I'ORCELLIO SCABER. 



47.5 



ONISCIDJB. 



POHCELLIO SCABER. 



Specific character. Elongate-ovate, rugose. Lateral processes of the 

 ceplmlon very prominent, with the external angle rounded. The middle pro- 

 cess triangular. Last joint of the pleon ending in a sharp triangular point, 

 deeply sulcated down the middle. 



Length, nearly half an inch. 



Porccllio scaber. 



LATREILLE, Hist. Nat. Crust, et Ins. vii. p. 45. 

 Gen. Cr. et Ins. i. p. 70. LEACH, in Trans. Linn. 

 Soc. xi. p. 375. Edinb. Enc. vii. p. 406. Suppl. 

 Enc. Brit. 1429. SAMOUELLE, Eut. Comp. p. 112. 

 DESMAEEST, Cons. Crust, p. 321. GTUERIN-MENEV. 

 Icon. R. An. Crust, t. 31, f. 7. MILNE EDWARDS, 

 Crust, iii. p. 167. CUVIER, R&gne An. (Edit. 

 Crochard), t. 71, f. 1. KINAHAN, Nat. Hist. Rev. 

 vol. 4, 1857, p. 277, pi. xxi. figs. 2 and 8. KOCH, 

 in Cont. Panzer Heft. 180, n. 6 and 7. WHITE, B. 

 M. Cat. Brit. Crust, p. 72. Pop. Hist. Brit. Crust, 

 p. 237, pi. xiii. fig. 2. BRANDT and RATZEBURG, 



