202 



Remarks. — This Bopyrid was first described by the present author as 

 Pleurocrypta affinis. It was subsequently referred by M.M. Giard and Bon- 

 nier to their genus Palcegyge, the type of which is P. Borrei, found on a fresh- 

 water prawn (Palsemon dispar) from the Indian Archipelago. On comparing the 

 figures and description given by the above named authors, I find, however, that this 

 form differs in several points very essentially from the one here treated of, exhibiting, 

 it would seem, a closer relation to the genus Bopyrns. On the other hand, I 

 cannot see any objection to including the present species in the genus Pseu- 

 dione of Kossman ; for the distinctive character quoted by M.M. Giard and 

 Bonnier between the genera Palcegyge and Pseuclione, viz., the presence or absence 

 of tubercles on the pleopoda, is certainly of no generic value, since there are spe- 

 cies in the genus Pleurocrypta both with and without such tubercles. 



Occurrence. — The type specimen, described by the present author in 

 1882, was found in the branchial cavity of a Pandalus leptorhynchus taken off 

 the west coast of Norway. Subsequently I have had the opportunity of ex- 

 amining 3 other specimens preserved in our Univ. Museum and named Bopyrus 

 crangorum Fabr. According to the label, they were taken by my late father at 

 Dr0bak from the branchial cavity of Pandalus Montagui (amiulicornis), and in 

 all respects agreed exactly with the specimen formerly examined by me. I can- 

 not therefore doubt that the nominal species Palcegyge Hoylii Giard & Bonnier, 

 which was likewise procured from Pandalus Montagui, is the very same species. 



Distribution. — British Isles. (Giard & Bonnier). 



2. Pseudione Hyndmanni, (Sp. Bate & Westw.). 



(PL LXXXV, fig. 2). 

 Phryocus Hyndmanni, Sp. Bate & Westwood, Brit, sessile-eyed Crust. Vol. n, p. 243. 



Specific Characters. — Body of female slightly asymmetrical, curved some- 

 times to the left, sometimes-to the right, according to its place on the host, and 

 oblong pyriform in outline, with the greatest width in front of the middle. Ce- 

 phalon comparatively small and deeply sunk into the 1st segment of mesosome, 

 frontal edge nearly straight and narrowly marginate. Segments of mesosome 

 with the lateral parts distinctly bilobed, anterior lobe slightly elevated and trun- 

 cated at the tip, posterior lobe rounded; coxal plates very small, scarcely pro- 

 jecting laterally. Metasome scarcely exceeding in length 1 / i of the body, epimeral 

 plates rounded, subimbricate, considerably larger on the one side than on the 

 other; last segment extremely small. Eyes inconspicuous. Antennae very small 



