354 



by its small size, comparatively compact form of body, and especially by tlie 

 unusually short antennae. The gnathopoda also exhibit a more powerful 

 structure than in most of the species of this genus. 



Occurrence. - I first detected this form in the Varangerfjord, at Yadso, 

 where a few specimens were collected from a depth of 20 30 fathoms. Sub- 

 sequently I have also found it off West Finmark, at Hammerfest, but farther 

 south it has never been met with by me. Out of Norway it has not yet 

 been recorded. 



Gen. 3. Stenopleustes, G. 0. Sars, n. 

 Syn. : Amphithopsis, Boeck (part) 



Body slender and compressed, with very thin and pellucid integu- 

 ments, and the back not carinated. Cephalon produced in front to a slight 

 rostral projection, postantennal corners but little produced. Coxal plates not 

 very large. Superior antennae very slender and much longer than the inferior. 

 Anterior and posterior lips nearly as in Paramphitltoe. Mandibles, on the 

 other hand, having the molar expansion well-developed, compressed, and 

 densely hairy at the transversely -truncated extremity, palp of moderate size. 

 First pair of maxillae comparatively shorter and stouter than in the preceding 

 genus, with the palp not expanded distally, and the basal lobe only provided 

 with a single plumose seta. Maxillipeds with the basal lobes rather broad, masti- 

 catory lobes comparatively small and having only a few slender hairs on the 

 inner edge, palp less elongated than in Paramphithoe, its last joint conically 

 produced in front of the insertion of the dactylus. Gnathopoda comparatively 

 feeble in structure, carp"us elongated and but slightly expanded below, pro- 

 podos rather narrow and imperfectly subcheliform. Pereiopoda slender and 

 elongated. Uropoda and telson nearly as in the preceding genus. 



Remarks. - The present new genus is nearly allied to Parampliitlto'<>, 

 differing however very markedly in the structure of the mandibles, of which 

 the molar expansion, unlike that in the above genus, is well developed and 

 of a peculiar, compressed form. Also in the structure of the 1st pair of 

 maxillee and that of the maxillipeds we find some differences from those in 

 the preceding genus. The 2 species described in the sequel, the only ones as 

 yet known, perfectly agree in all essential characteristics, though being, 

 specifically, pretty well defined. 



