478 



ISOPODA. 



NORM ALIA. 



ONISCIUiE. 



ONISCIDM. 



PORCELLIO DILATATUS. 



F>pecific character. Very broad, depressed, rough, and gi-anular. Lateral 

 frontal processes very prominent, rounded at the apex, and concaTe. 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. 



PorcelUo dilatatus. Brandt, Bull. Mosc. vi. p. 176. Brandt and Ratze- 

 BURG, Arzn. Thiere, ii. pi. 12, f. 6. Burrersdijk, 

 Aunot. p. 44. KiNAHAN, Dublin Nat. Hist. Rev. 

 vol. 4, 1857, p. 278. Rohnttzler, Onisc. Bonn, 

 p. 23. 



PorcelUo scaber. Milne Edwards, Crust, iii. p. 167. 



This 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 antennae are rather short, with the two terminal 



