2 Mr. T. Scott on Scottish Crustacea. 



more slender than the other appendages, as sliown in the 

 figure (fig. 1). . , r 



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 tlie female and male of this Clyde parasite agree very 

 well with the description and figures of Pleurocryijta Jongi- 

 hranchiata as given in Prof. G. O. Sars's recently published 

 monogra})h on the Norwegian Isopoda *, but they ditfer 

 slightly from the description and figures of the same species 

 in vol. ii. of 'British yessih-eyed Crustacea' by Bate and 

 Westwood t, the diflference 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 

 iemale, Professor G. O. tfars believes that the species described 

 by him " is identical with that described in * British Sessile- 

 eyed Crustacea ' as Phryxus longihranchiatxisy It may be 

 remarked that M. Bonnier, in his excellent monograph |, 

 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 Fleurocrypta recorded here 

 was obtained appeared to be somewdiat immature; at first I 

 thought it might le the Galathea nexa, Embleton, the species 

 on which G. U. Sars obtained his specimens of Pleurocrypta 

 lovgihranchiata; 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. t\exa or G. squamifera, Leach, which belong to the 

 same group as G. dispersa. In an interesting monograph 

 of the " Galatheidffi des Cotes de France " by M. Jules 

 Bonnier §, the author divides Galathea into three groups : — 

 1st, species furnished with an epipodite on the first pair of 



* 'Crustacea of Norway,' vol. ii. p. 20G, pi. IxxxvL fig. 2 (1898J. 

 t 'British Sessile-eyed Crustacea,' vol. ii. p. 246 (1868). 

 X ' Contributiou a I'Etude des £picarides : les Bopji-idse,' p. 316 (1900). 

 § * Bulletin Scientitique de la France et de la Belgique ' (1888), 

 pp. 35-95. 



