DUBLIN NATURAL HISTORY SOCIETY. 
199 
gtiish 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., Pig. 2/). The habits and favourite loca¬ 
lities of the two are very distinct. 
Koch founded the species on specimens brought from Yienna by M. 
Jenisson; the exact locality unknown. Itea nana, which appears to differ 
only in colour, was from the same collection. 
Philougria rosea ( Koch ). Plate XXIII., Pig. 3. 
Synonym :— Itea rosea {Koch). 
Body, except posterior abdominal rings, tuberculated; eyes very 
small, black, and conspicuous; internal antennae 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, P. 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. 
Por the drawings of this and the other species I am indebted to my 
friend Charles Spence Bate, P. 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 Honnybrook, 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 stripes—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 Bate’s Beport on 
the British Amphipoda, at the same time wishing to guard myself from 
being supposed to have adopted the idea that there are three primary 
divisions of the crustacean body, viz., kephalon (head), pereion (thorax), 
pleon (abdomen). I cannot satisfy myself that in the type Crustacea of 
