2 Mr. T. Scott on Scottish Crustacea. 
more slender than the other appendages, as shown in the 
figure (fig. 1). 
The male is somewhat depressed, and when viewed from 
above is nearly cylindrical. It is very nearly 2 millim. long 
and its breadth is equal to fully one third of the entire length ; 
the forehead is broadly and evenly rounded; the metasome 
consists of an entire piece of a triangular form, the apex of 
which is somewhat blunt-pointed. 
Both the female and male of this Clyde parasite agree very 
well with the description and figures of Pleurocrypta longi- 
branchiata as given in Prof. G, O. Sars’s recently published 
monograph on the Norwegian Isopoda*, but they differ 
slightly from the description and figures of the same species 
in vol. ii. of ‘ British Sessile-eyed Crustacea’ by Bate and 
Westwood J, the difference being more marked in the male 
than in the female; the last-mentioned authors in their 
description of the male state that the “ pleon (metasome of 
G. O. Sars) is composed of an elongate ovate-conic piece, in 
which the segments are fused together,’ and their figure of 
the male corresponds with the description. Notwithstanding 
this difference and the proportionally narrower form of the 
female, Professor G. O. Sars believes that the species described 
by him “is identical with that described in ‘ British Sessile- 
eyed Crustacea’ as Phryaus longibranchiatus.” It may be 
remarked that M. Bonnier, in his excellent monograph f, 
while accepting the identification of the learned author of the 
‘Crustacea of Norway,’ does so with a certain amount of 
reserve. 
The Galathea on which the Pleurocrypta recorded here - 
was obtained appeared to be somewhat immature; at first I 
thought it might be the Galathea neva, Embleton, the species 
on which G. O. Sars obtained his specimens of Pleurocrypta 
longibranchiata; but I am now inclined to ascribe it to the 
more common (Galathea dispersa, Spence Bate; it agrees 
better with this species in the form of the rostrum than with 
either G. nexa or G. squamifera, Leach, which belong to the 
same group as G. dispersa. In an interesting monograph 
of the “ Galatheide des Cotes de France” by M. Jules 
Bonnier §, the author divides Galathea into three groups :— 
Ist, species furnished with an epipodite on the first pair of 
* “Crustacea of Norway,’ vol. ii. p. 206, pl. Ixxxvi. fig. 2 (1898). 
+ ‘British Sessile-eyed Crustacea,’ vol. ii, p. 246 (1868). 
t ‘Contribution a l’Etude des Epicarides: les Bopyridz,’ p. 816 (1900). 
§ ‘Bulletin Scientifique de la France et de la Belgique’ (1888), 
pp. 85-95. 
