456 



ISOPODA. 

 NOB MALI A. 



ONISCID^. 



ON I SOI D^. 



PHILOUGRIA RIPARIA. 



Specific character. EUiiJtical, smootli and glossy. Inner antennse 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. 



Ilea riparia. Koch, in Cent. 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. 

 Ilea 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 uuifornily 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 



