of the last pair very large, oval, fully as long- as the remainder part of the 

 leg. Last pair of uropoda with the rami very narrow, mueronifonn, and 

 without any marginal setse, the outer one being the longer and haying the 

 terminal joint spiniform. Telson not nearly twice as long as liroad, with 

 1 or 2 pairs of dorsal denticles, cleft extending nearly to the base. Uodv 

 pellucid whitish, without any pigmentation. Length of female f> mm. 



Remarl-s. - - 1 at first believed this little form to belong to tlic follow- 

 ing genus. Having, however, made out its anatomy in detail, 1 lind it to 

 be a true Hoplonyx, though differing in some points, especially as to the 

 structure of the last pair of uropoda and the absolute want of eyes, rather 

 markedly from the other species. 



Occurrence. - I have as yet only met with '2 specimens of this small 

 species, both being collected in the same place, viz., at Lexvigen, Trond- 

 hjemsfjord, from a depth of nearly 150 fathoms. 



Gen. 24. Centromedon, G. 0. Sar*, n. 

 Syn: Anonyx, Lilljeborg (ex parte). 



Body, as a rule, short and 'stout, with rather deep coxal plates. 

 Lateral corners of cephaloii acutely produced, as also those of the last pair 

 of epimeral plates of metasome. Eyes imperfectly developed or quite want- 

 ing. Antennae (in female) rather stout and subequal in length. Epistome 

 not at all projecting. Anterior lip large and broadly rounded. Mandibles 

 of moderate size, molar expansion conico-attenuated, palp rather large and 

 originating much nearer the tip than does the latter. First pair of maxilhp 

 with the terminal joint of the palp scarcely expanded at the tip and only 

 armed with a restricted number of spines; 2nd pair with the inner lobe more 

 elongate than in the 2 preceding genera, though a little shorter than the 

 outer. Maxillipeds less strong, masticatory lobe oblong oval, not reaching to 

 the end of the antepenultimate joint of the palp; the latter having the ter- 

 minal joint comparatively small and scarcely claw-like. Anterior gnathopoda 

 rather stout, imperfectly subcheliform ; the propodos obpyriform, without 

 any distinctly defined palmar edge; dactylus of moderate length and simple. 

 Posterior gnathopocla more slender than the anterior, propodos transversely 

 truncated at the lip, dactylus small. Pereiopoda moderately slender, basal 



