4 Mr. T. Scott on Scottish Crustacea. 
some, as in the males of other Pleurocrypti, is composed of 
one piece ; at the proximal end it is about as broad as long, 
but the sides, which are broadly but slightly unequally 
rounded, converge posteriorly and terminate in a minute 
sharp-pointed apex, as shown in the drawing. 
So far asl know, Pleurocrypta Patiencet appears to be the 
first Bopyrid parasite that has hitherto been recorded from 
Caridion Gordont, and this is the more interesting from the 
fact that these parasites have been so carefully and exhaus- 
tively studied by such eminent investigators as Prof. Giard 
and M. Bonnier in France and Prof. G. O. Sars in Norway. 
Pleurocrypta cluthe, sp.n. (Pl. I. fig. 5.) 
I am indebted for this Bopyrid to the same gentleman who 
sent me the species just recorded. Pleurocrypta cluthe was 
obtained on a specimen of Pandalina (Pandalus) brevirostris 
(Rathke) dredged in the Clyde on April 16th, and is 
probably identical with the form observed by Dr. (now 
Professor) J. R. Henderson in the branchial chamber of 
Pandalina brevirostris, and referred to by him under the 
general name of ‘ Bopyrus” in his work on “The Higher 
Crustacea of the Clyde” *, and which M. Jules Bonnier, in 
his monograph on the Bopyride already mentioned, ascribes 
doubtfully to the genus Pseudione}t. It is not likely that 
M. Bonnier had at this time examined specimens of the 
Bopyrid referred to—at least he had not seen a specimen of 
a male, which, as will be shown, is different from the male of 
Pseudione. 
The female is about 3°5 millim. (4 of an inch) in length, 
and in its general form, which is somewhat similar to Pleuro- 
crypta Patienced, is distinctly unsymmetrical. ‘The anterior 
end is obliquely truncate and the head deeply immerged in the 
first segment of the mesosome. The pleopoda are scarcely 
developed and the uropoda are very like those of Pleurocrypta 
Patiencet. 
The male (fig. 5) is slightly over a millimetre in length 
and is elongate, narrow, and subcylindrical, its greatest width 
being scarcely equal to one third of the entire length. The 
cephalon is bluntly rounded in front and is somewhat narrower 
than the first segment of the mesosome, to which it appears 
to be closely applied; the segments of the mesosome are, for 
the most part, widely separated, as in the male of Pleuro- 
crypta Hendersont, Giard and Bonnier (P. marginata, G. O. 
* Nat. Hist. Soc. Glasg., Trans. vol. i. (n.s.) p. 87 (1886). 
+ ‘Les Bopyride,’ by M. Jules Bonnier, p. 800 (1900). 
