4 Mr. T. Scott on Scottish Crustacea. 



some, as in the males of other Pleurocryj^ti, is composed of 

 one piece ; at the proximal end it is about as broad as lon^. 

 but tlie 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 as I know, Pleurocrypta Patiencei appears to be the 

 first Bopyrid parasite that has hitherto been recorded from 

 Caridion Gordoni, and this is tlie 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. 0. Sars in Norway. 



Pleurocrypta clutha', sp. n. (PI. I. fig. 5.) 



I am indebted for this Bopyrid to the same gentleman who 

 sent me the species just recorded. Pleurocrypta cluthce was 

 obtained on a specimen of Pandalina (Pandalus) hrevirostris 

 (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 

 I^aiidaliiia hrevirostris, 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 Bopyridaj already mentioned, ascribes 

 doubtfully to the gtwna Pseudione-\. 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. (| of an inch) in length, 

 and in its general form^ which is somewhat similar to Pleuro- 

 crypta Patiencei, is distinctly unsymmetrieal. 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 

 Patiencei. 



The male (fig. 5) is slightly over a millimetre in length 

 and is elongate, narrow, and subcyliiidrical, 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 fir&t 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 IJendwsoni, Giard and Bonnier {P. maryinata, G. O. 



* Nat. Hist. Soc. Glasg, Trans, vol. i. (n. s.) p. 37 (188G). 

 t ' Les Bopyrid*,' by M. Jules Bounier, p. 300 (1900). 



