478 ONISCID &. 
ISOPODA. ONISCIDA. 
NORMALIA. 

PORCELLIO DILATATUS, 
Specific character. Very broad, depressed, rough, and granular. Lateral 
frontal processes very prominent, rounded at the apex, and concave. Median 
lobe obtusely triangular, moderately developed. Terminal segment of the 
pleon rounded at its apex, nearly flat above. Terminal plate of uropoda flat 
and broadly ovate, pointed at the tip. 
Length, five to seven lines. 
Porcellio dilatatus. Brant, Bull. Mose. vi. p- 176. Branpr and Rarze- 
BuRG, Arzn. Thiere, ii. pl. 12, f. 6. BURGERSDIJK, 
Annot. p. 44. Krnanan, Dublin Nat. Hist. Rey. 
vol. 4, 1857, p. 278. ScHNITZLER, Onise. Bonn. 
p- 23. 
Porcellio scaber. Mitye Epwarps, Crust. iii. p. 167. 
TuIs species is ordinarily much larger than P. scaber, 
from which it is easily distinguished by its very broad. 
form, and by the less scabrous surface of its body. The 
outer antenne are rather short, with the two terminal 
oe 
