120 



ever, rather different, and very strongly built, prehensile, carpus considerably ex- 

 panded, and armed inside with 2 long spines, propodos oblong oval, with a strong 

 spine inside, dactylus strong and curved. Female operculum with a spiniform 

 projection near the base; that in male simple, not transformed as in other 

 Asellota. Genital prominence in male very large, spiniform, recurved, issuing 

 from the ventral face of last segment of mesosome, immediately in front of the 

 operculum. Uropoda in both sexes of the same appearance, projecting but slightly 

 beyond the edge of the caudal segment, outer ramus considerably smaller than 

 the inner, Colour whitish, semipellucid. Length of adult female 2 mm., of 

 male iy 2 mm. 



Remnrl-x. This form was first described by the present author only from 

 female specimens. The male, of which 2 specimens were found subsequently 

 among the females, looks so very different, that at first I was in some doubt of 

 its belonging to the same species. After having examined more closely the several 

 appendages, I cannot, however, doubt that it is in reality the male of the present 

 species. The 1st pair of legs are certainly very different; but this may be merely 

 a sexual character; for in all the other appendages, the resemblance to the female 

 is very close. It is a very remarkable fact, that the operculum in neither of the 

 2 specimens examined showed any trace of the usual transformation, though the 

 male character of the specimens otherwise could easily be demonstrated, both by 

 the greatly projecting sexual prominence, and by the presence of well-developed 

 testes shining distinctly through the integuments in their usual place. In the 

 Caspian species, on the other hand (of which as yet only a solitary male specimen 

 is known), the sexual characters were quite normally displayed. 



Occurrence. I have as yet only found this form off the Lofoten Islands, 

 at Skraaven, in depths ranging from 120 to 250 fathoms. Out of Norway, it 

 has not yet been recorded. 



Gen. 2. MacrOStyllS, G. O. Sars, 1863. 



Syn : Vana, Meinert. 



Generic Characters. Body narrow, sublinear, with the 3 posterior seg- 

 ments of mesosome very sharply marked off from each other, the 4 anterior more 

 densely crowded together. Cephalon rather large, subtriangular, frontal part con- 

 siderably produced. Caudal segment oblong, obtusely produced at the tip. Supe- 

 rior antennae extremely small, with the ilagellum rudimentary. Inferior antennae 



