OITBLnr KATUmX mSTORT BOCXETT. 115 



The superior size and the robust rotundity of this species distin- 

 guish it at a glance from Phil, riparia. Other characteristics are afforded 

 by the form of the telson, which is only seemingly emarginate at the 

 tip ; and by the integument, which in this species is covered with a series 

 of small pits (Plate XXIII., Fig. 2/). The habits and favourite loca- 

 lities of the two are very distinct. 



Koch founded the species on specimens brought from Vienna by M. 

 Jenisson ; the exact locality unknown. Ilea nana, which appears to differ 

 only in colour, was from the same collection. 



Philougeia eosea {Koch). Plate XXIII., Fig. 8. 

 Synonym : — Itea rosea {Koch). 



Body, except posterior abdominal rings, tuberculated ; eyes very 

 small, black, and conspicuous ; internal antennaB very conspicuous, ex- 

 tending beyond front ; lateral angles of antennal ring strongly marked 

 beneath orbits ; telson plane above, apex rounded, with four (?) strong 

 bristles; external antennae hairy; cephalo-thoracic rings and head 

 coarsely granulated, the granules each bearing a bristle; abdominal 

 rings, first to third granulated ; fourth, fifth, and telson smooth. 



Colour : clear minium-rose, with white dots, and a white stripe down 

 the median line, or a dead white with a dark median line. 



Length '15 inch. 



Habits much the same as the rest of the group ; seems to be more 

 humid in its haunts ; does not roll; feigns death ; and is not quite as active 

 as either of the other species. 



Habitat : in damp places, in gardens and courts, and in dark cellars 

 (the pure white variety). 



Localities : the first specimen of this species I saw was taken at Ply- 

 mouth by my friend C. Spence Bate, F. L. S., in his cellar. On a further 

 search there and in his court-yard I found the species abundantly. I 

 never met it elsewhere. 



For the drawings of this and the other species I am indebted to my 

 friend Charles Spence Bate, F. L. S. 



Koch states that the species is not common in Germany. Itea Mengii, 

 of Zaddach, which at one time I was inclined to look on as this species, 

 I am now rather inclined to identify with specimens which I have ob- 

 tained in Donnybrook, and which, though differing from Ph. riparia in 

 the following points — head scabrous; cephalo-thoracic rings covered with 

 rough granulations, abdomen nearly same width as cephalo-thorax ; tel- 

 son not emarginate ; colour, white, with dark slripes — I still hesitate to 

 separate from that species of which I suspect they are the young state. 



The only terms used in this Paper, additional to those in the Analysis, 

 are — telson (last abdominal ring), and posterior pleopoda (last pair of ap- 

 pendages), both of which I have adopted from Spence Bute's Report on 

 the British Amphipoda, at the same time wishing to guard myself from 

 being supposed to have adopted the idea that there arc three primary 

 divisions of the crustacean body, viz., kephalon (head), pereion (thorax). 



