PORCELLIO LAVIS. 483 
ISOPODA 
ON E 
NORMALTIA. NISCID A. 

PORCELLIO LAVIS. 
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 suleate down the middle. Uropoda considerably elongated. 
Length, three-quarters of an inch. 
Porcellio levis. Latreitue, Hist. Nat. Crust. et Ins. vii. p. 46; Gen. Cr. 
et Ins. i. p. 70. Lamarck, Anim. s. Vertébr. t. 5, 
p.- 154 (Oniscus l.). Minne Epwarps, Crust. iii. 
p. 169. Krnanan, Nat. Hist. Rev. vol. iv. 1857, 
p. 278. Wuurs, B. M. Cat. Brit. Crust. p. 72. Pop. 
Hist. Brit. Crust. p. 237. Jounsson, Syn. Framst. 
Sver. Onise. p. 27. Zappacn, Syn. Crust. Pruss. p. 13. 
Cylisticus levis. Sounrrzumr, Onisc. Agri Bonn. p. 25. 
Tuis 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 
ae 
