694 



delicate olfaetory cilia Inferior antennae in female but little longer than the 

 superior, with the flagellum about the length of the peduncle; those in male 

 very much elongated, equalling in length the whole body, flagellum extremely 

 slender, filiform. Anterior gnathopoda rather stout, pro])odos gradually widen- 

 ing distally, witli the palm nearly transverse and somewhat curved, not 

 nearly attaining the length of the hind margin, its edge clothed with a dense 

 series of long and stitf bristles, carpal lobe projecting somewhat beyond the 

 propodos. Posterior gnathopoda extremely slender and but sparingly Setous, 

 propodos very narrow, sublinear, thumb of the chela l)ut little broader than 

 tlie dactylus, carpal process projecting considerably beyond the latter. The 

 2 anterior pairs of pereiopoda very stout and densely setiferous, carpal joint 

 somewhat expanded and scarcely longer than the propodal one, dactylus 

 extremely minute, nearly obsolete. The 2 succeeding pairs likewise short and 

 stout, though somewhat increasing in length. Last pair of pereiopoda exceed- 

 ing half the length of the body, basal joint oval quadrangular in form, with 

 the posterior edge quite straight, and terminating in a small, angular lobe. 

 Last pair of uropoda with the rami narrow lanceolate, and armed each with 

 a number of small spines. Telson oval in form, with the tip evenly rounded. 

 Body semipellucid, of a whitish coloui-, with a slightly yellowish tinge. Length 

 of adult female (> mm., of male 6V2 mm. 



Bcmarlcs. — There cannot, I think, be any doubt that the above-de- 

 sci'ibed form is that recorded by Sp. Bate as Kroi/era areiiaria. and this is still 

 more confirmed by tlie detail figures given by Dr. Hoek of the same form. Now, 

 it will appear evident, on a closer comparison of the figures given by Boeck of 

 his P. norvegiciis with those here reproduced, that in reality, he has had before 

 him the very same species, and that he was consequently quite riglit in iden- 

 tifying both. From P. arcticus it may at once be distinguished by the .struc- 

 ture of tiie gnathopoda, both pairs of whicli exhibit characteristic differences. 

 Moreover the peculiarly irregular shape of the anterior pairs of coxal plates 

 occurring in both sexes, will serve for easily distinguishing this species from 

 the former. 



Occurrence. — I have of late years found this species occasionally iti 

 2 localities of the Norwegian coast, viz , at Skudesnes and in the outer part 

 of the Christianiatjord, at Sandasund. It occurred in both jjlaces in about 

 10 fathoms, on a bottom of coarse sand. 



Distrihiilion. — Dutch coast (Hoekj. 



