76 



Remarks. In their outer habitus the species of this genus exhibit 

 some resemblance to those of the genus Orchomenella, though the body appears, 

 as a rule, somewhat more slender and compressed. In the structure of the 

 oral parts as also of the 2 pairs of gnathopoda there are, however, well 

 marked differences between the 2 genera. Off the coast of Norway occur no 



<J 



less than 4 well distinguished, though very nearly allied species. Another 

 northern form, produced on the Norwegian North Atlantic Expedition, was 

 wrongly referred by the author to T. Horringii Boeck, but constitutes in fact 

 a distinct new species 1 , nearly allied to T. angulata Gr. 0. Sars, to be de- 

 scribed in the sequel. A second deep water species, T. pusiUa, was described 

 by the author from the same Expedition. Moreover several exotic species 

 have been recorded. Thus Dr Hansen refers, but with some doubt, a very 

 handsome Greenland species, T. pulclira, to this genus, and the Rev. Mr. Steb- 

 bing describes 2 species from the Challenger Expedition, viz., T. Itai-lxitipes, 

 and T. antennipotens, neither of which, however, in my opinion can properly be 

 referred to the present genus, the first being apparently an Orclwmenella, 

 whereas the latter undoubtedly belongs to the genus Pseudotrypliosa, to be de- 

 scribed in the sequel. 



29. Tryphosa nana, (Kroyer). 



(PI. 27, fig. 1.) 

 Anonyx namis, Kroyer, Naturh. Tidsskr. 2 R. 2 Bd p. 30. 



Body rather compressed, smooth and polished. Cephalon longer than 

 the 1st segment of mesosome, lateral corners not very projecting and rounded 

 at the tip. Anterior coxal plates more than twice as deep as the body, 1st 

 pair with the anterior edge distinctly concaved, 4th pair obtusely produced 

 posteriorly in their lower part, 5th pair somewhat more broad than deep. 

 Last pair of epimeral plates of metasome rectangular, posterior edge straight. 

 First segment of urosome without any dorsal projection. Eyes of moderate 

 size, oblong oval, pigment light red. Superior antennae about as long as the 

 cephalon and the 2 first segments of mesosome combined, 1st joint of the pe- 

 duncle twice as long as the other 2 taken together; flagellum considerably 

 longer than the peduncle, 9-articulate, with the 1st joint comparatively short and 

 scarcely longer than the 2 succeeding ones combined; accessory appendage very 



1 The said species, which will be described and figured in an appendix to the pre- 

 sent work and for which I propose the name of T. comprcasa, is chiefly distinguished by 

 the very deep cephalon, the lateral corners of which are considerably projecting though 

 obtuse at the tip, by the very narrow linear form of the eyes, and finally by the con- 

 siderable size and powerful structure of the propodos of the posterior gnathopoda. 



