456 



ISOPODA. 



NORMALIA. 



ONISCIM. 



ONISCID^. 



PHILOUGRIA RIPARIA. 



Specific character. Elliptical, smooth and glossy. Inner antennae very 

 minute and inconspicuous. Outer antennae nine-jointed. Terminal segment 

 of the pleon deeply emarginate on each side, truncate, triangular, with the 

 extremity deeply emarginate. 



Length, three -twentieths of an inch. 



Itea riparia. KOCH, in Cont. Panz. Ins. Deutschl. 162, 17 ; and 



Deutschl. Crust. 22, 17. 

 Philougria riparia. KINAHAN, Nat. Hist. Rev. vol. v. 1858, pp. 197, 198, 



pi. 23, fig. 1. 



Itea Icevis (?). ZADDACH, Syn. Crust. Pruss. p. 16. 



Philougria celer. KINAHAN, Nat. Hist. Rev. vol. iv. 1857, p. 281, 



pi. 22, figs. 1-4. 



THE colour of this small species is uniformly claret- 

 brown, appearing under a lens to be beautifully marbled 

 with white. It is distinguished by its elliptical outline, 

 and by the terminal segment of the tail being deeply 



