593 



Occurrence. — I have met with this form not infrequently in several 

 localities of the west coast of Norway, as also in the Trondhjemsfjord; and 

 Boeek records it also from the Lofoten Isles (Skraaven). It is a true deep- 

 water form, only occurring in depths of more than 50 fathoms. 



Distrihulion. — Off Iceland, Bear Island and Spitsbergen (Norw. 

 North Atl. Exped.). 



Gen. 5. PodoceruS, Leach, 1815 



Syn : Jassa, Leach, 

 » Cratophium, Daua. 



General habitus about as in the preceding genus. Coxal plates not very 

 large, the 2 anterior pairs in male rather diiferent in shape from the 2 

 succeeding pairs, which are subequal in both sexes and much deeper than 

 the former. Eyes distinct, though not very large, placed near the lateral 

 lobes of the cephalon. Antennae of a structure similar. to that in the genus 

 Ischi/rocerics, though somewhat more unequal, the inferior ones being both 

 considerably longer and also more strongly built than the superior. Oral 

 l»arts nearly as in that genus. Gnathopoda very unequally developed, the 

 anterior ones being comparatively feeble, whereas the posterior ones are very 

 powerful, and of rather different shape in the 2 sexes, in female subcheliform, 

 in male distinctly chelate, the jjropodos being in the latter provided with a 

 more or less projecting, thumb-like process, against which the dactylus impinges, 

 when closed. Pereiopoda, uropoda and telson of a structure similar to that 

 in the genus Ischyrocerus. 



Bemarls. — This genus was established by Leach as early as in the 

 3'ear 1815, to include a British species P. variegatus- The genus Jassa of the 

 same author is indistinguishable from Podocerus, and must be considered as 

 merely a synonym. This is also the case with the genus Crafophinm of 

 Dana. The genus is nearly allied to Ischyrocerus., from which it chiefly 

 differs in the structure of the posterior gnathopoda, which in the female are 

 much more strongly built than in that genus, and in the male exhibit a most 

 peculiar aspect owing to the distinctly projecting, thumb-like process issuing from 

 the lower side of the propodos, whereby these limbs become modified to cheli- 

 form organs. The genus comprises several species both from the northern 

 and southern hemispheres. To the fauna of Norway belong 3 species, to be 

 described below, one of which is now for the first time established. 



