430 



Bemarls. — The present new species is veiy nearly allied to the 2 

 preceding ones, though apparently distinct, exhibiting, as it does, several 

 well-marked peculiarities, among which the rudimentary nature of the ej'es 

 is the most prominent. 



Occurrence. — I have met with this form in 3 different localities of 

 the Norwegian coast, viz., at Jelse in Ryfylke, at Sunde in the outer part 

 of the Hardangerfjord, and in the Trondhjemsfjord, at Rodbjerget. In all 

 the localities it occurred rather sparingly, in a very considerable depth rang- 

 ing from 100 to 400 fathoms. 



Distribution. — Skagerak (Stockholm Museum). 



10. Rhachotropis twm49; G. 0. Sars. 



(PL 162). 

 Tritro2)is tuntida, G. O. Sars, Oversigt af Norges Crustaceer, I, ji. 104, PI. 5, fig. 7. 



Body rather short and stout, and much inflated in its anterior part, 

 which is quite smooth and evenly vaulted above. Metasome, as usual, 

 tricarinate, but having the carinas compai-atively low, and their projections 

 small, dorsal process of last segment altogether absent. Urosome without any 

 dorsal projections. Cephalon about the length of the first 2 segments of 

 mesosome combined, and very broad, rostral projection somewhat prominent, 

 lateral corners forming on each side a narrow linguiform, somewhat deflexed 

 lobe defined posteriorly by an even sinus. Coxal plates small, and nearly 

 of same shape as in the 3 preceding species. Last pair of epimeral plates 

 of metasome obtusely rounded at the lateral corners, and having, as usual, 

 the posterior edge strongly serrated, the serrations being also continued for 

 some distance on the inferior edge. E^'es very large and convex, rounded 

 oval, with the anterior edge more or less distinctly insinuated, visual 

 elements very conspicuous, pigment dark brown. Superior antennae in female 

 comparative!}' short, not attaining Vs of the length of the body, and without 

 distinct calceolte, 1st joint of the peduncle rather thick, and longer than the 

 2nd, last joint scarcely half the length of the former, flagellum longer than 

 the peduncle, and composed of 9 articulations only. Inferior antennae but 

 little longer than the superior, the last 2 joints of the peduncle about of 

 same length, flagellum half the length of the peduncle. Both pairs of an- 

 tenna in male much more elongated, 1st joint of the flagellum in the su- 

 perior ones very large, and densely clothed with delicate sensory hairs. 

 Gnathopoda rather powerful and somewhat unequal, the propodos of the 

 anterior ones being regularly oval, with the breadth considerably more than 



