498 



strong, and in both sexes nearly equal-sized, those in female having the 

 propodos oval quadrangular in form, with the palm somewhat more oblique 

 in the anterior than in the posterior pair; those in male a little stronger, 

 with the propodos more oblong in form. The 3 posterior pairs of pereiopoda 

 comparatively short and stout, with tlie outer joints edged with fascicles of 

 small spines, basal joint of antepenultimate pair having the infero-posteal 

 corner obtuse-angular. Last pair of uropoda with the outer ramtis well- 

 developed, and coarsely spinous on both edges, inner ramus extremely small, 

 scarcely attaining l /s of the length of the outer, and narrow conical in form. 

 Telson comparatively small, each half with 2 lateral, and 3 apical spines. 

 Colour yellowish brown, with a pinkish patcli on eacli side, at the base of 

 the pleopoda. Length of adult female 15 mm. 



Remarks. The present species was first described by Leach under 

 tlie above name. It is quite certainly identical with the form subsequently 

 recorded by Rathke as G. poecilurus. and in all probability also his G. Krvyeri 

 is the same species. Moreover the G. Olivii of M. Edwards must be adduced 

 as a synonym. It has. by most subsequent authors, except Sp. Bate, Boeck 

 and Dr. Hoek, been regarded as only a variety of G. locusta, from which 

 however, on a closer examination, it may be easily distinguished by several 

 well-marked characteristics. For instance the lateral corners of the cephalon 

 are rather differently shaped, and the armature of the urosome is also rather 

 unlike. Moreover the eyes are much narrower, the gnathopoda differ less in 

 the 2 sexes, the pereiopoda are shorter and stouter, and finally the uropoda 

 are markedly distinguished by the poor development of the inner ramus. 



Occurrence. - The species is found along the whole south and west 

 coasts of Norwajr, and extends northwards at least to the Trondhjemsfjord, 

 according to Rathke even to the Namsenfjord. It is a true littoral form, 

 being generally found above the usual tide marks, beneath detached moist 

 algse, in company with Orcliestia littorea and Hyale NUssoni. 



Distribution. - British Isles (Sp. Bate), Bohuslan (Bruzelius), Kattegat 

 (Copenhagen Museum), Dutch coast (Hoek). coast of France (Chevreux), 

 Mediterranean (Heller), Black Sea (Rathke). 



