beyond the middle and not at all widening posteriorly. Colour uniform! v 

 whitish. Length of adult female 12 mm. 



Remarks. From the Challenger species described by the Rev. Mr. 

 Stebbing the present form would seem to differ, among other things, by the 

 somewhat less robust structure of the anterior gnathopoda, as also by a differ- 

 ent form and armature of the telson. 



Occurrence. - I have only met with 2 specimens of this form, both 

 females. They were collected last summer in the Trondhjemsfjord from a 

 dead fish fastened on a fishing line, which was let down in a depth of about 

 100 fathoms. 



Gen. 18. Tryphosa, Boeck, 1870. 



Body comparatively slender and compressed, with rather deep coxal 

 plates, the 1st pair of which, however, are much smaller than the succeeding 

 ones and tapering distally. Last pair of epimeral plates of metasome smooth, 

 nearly rectangular or very slightly produced at the infero-lateral corners. 

 Superior antennae, comparatively slender, with well developed accessory ap- 

 pendage. Inferior antennae in female a little longer than the superior, in 

 male scarcely half the length of the body. Epistome forming a rounded 

 lamina projecting in front of the anterior lip. Mandibles of moderate size, 

 molar expansion distinctly developed, palp not very slender and originating at 

 about the same level as the latter, terminal joint oval. First pair of maxillae 

 with the masticatory lobe obliquely truncated at the tip, terminal spines 

 crowded together, basal lobe small, obtuse at the tip, with 2 plumose apical 

 setae. Second pair of maxillae with the lobes not very elongated and obtuse 

 at the end. Maxillipeds of moderate size ; masticatory lobe rather large, ob- 

 long, projecting beyond the antepenultimate joint of the palp; the latter not 

 very strong. Anterior gnathopoda comparatively slender and feeble in struct- 

 ure, carpus elongated, propodos nearly linear, with a well defined palmar 

 edge. Posterior gnathopoda less slender than usual, propodos more or less 

 dilated and densely hirsute, tip scarcely produced beneath the dactylus. Per- 

 eiopoda of moderate size, basal joint of the 3 posterior pairs very large MI id 

 laminar. Last pair of uropoda but little projecting beyond {he preceding pair; 

 rami in female generally simple, not setous, in male provided on 1lie inner, 

 edge with plumous seta?. Telson rather large, oblong oval and deeply deft; 

 terminal lobes each with a single apical denticle. 



