FOR CELL TO L/RVIS. 



ISOPODA. 



NORM A LI A. 



483 



ONISC1DJB. 



PORCELLIO L&VIS. 



Specific character. Very convex, smooth. Lobes of the sides of the front 

 of the cephalon slightly prominent, small, and rounded at the outer angle ; 

 middle lobe very short. Terminal segment of pleon rounded at the tip, 

 deeply silicate down the middle. Uropoda considerably elongated. 



Length, three-quarters of an inch. 



Porcellio Icevis. 



Cylistlcus laivis. 



LATREILLE, Hist. Nat. Crust, et Ins. vii. p. 46 ; Gen. Cr. 

 et Ins. i. p. 70. LAMARCK, Anim. s. Vertebr. t. 5, 

 p. 154 (Oniscus I.}. MILNE EDWARDS, Crust, iii. 

 p. 169. KINAHAN, Nat. Hist. Rev. vol. iv. 1857, 

 p. 278. WHITE, B. M. Cat. Brit. Crust, p. 72. Pop. 

 Hist. Brit. Crust, p. 237. JOHNSSON, Syn. Framst. 

 Sver. Onisc. p. 27. ZADDACH, Syn. Crust. Pruss. p. 13. 



SCHNITZLER, Onisc. Agri Bonn. p. 25. 



THIS is the largest British species of the genus, and 

 is well distinguished by the smooth upper surface of the 

 animal, the small lateral lobes of the face, and the great 



i i 2 



