little shorter and conspicuously broader at the base; the diffé- 

 rence between this narrowly triangular process and the exceed- 

 ingly narrow, nearly subulate rostrum in many Atlantic spé- 

 cimens of the s a me size is in reality so considérable that one 

 would not hesitate in considering such spécimens as belonging 

 to différent species, if the material at hand did not contain 

 every possible transition between them. In adult maies the 

 rostrum is often a little longer than in Atlantic spécimens, but 

 sometimes very short or even rudimentary. 



Nematoscelis tenella, G. O. Sars 



Nematoscelis tenella, G. O. Sars, op. cit., p. 1 33, Pl. xxv, 

 figs. 5-y. 



Description. — In my former treatise it was only stated 

 that N. tenella, as described and figured by Sars, has been estab- 

 lished on veryyoung spécimens of a species alliedto N. microps: 

 Having now obtained a good material, I can give brief descrip- 

 tions of adults and of very young spécimens. 



*This species is more slender, but only a little smaller, than 

 N-. microps. In ail half-grown, rather large or adult spécimens 

 the oblique eyes are nearly black, with their upper anterior 

 section very much larger, especially broader, than the lower 

 part; furthermore the upper outline behind rostrum is feebly 

 and regularly convex, because there is no angle or, at the most, 

 a vestige of an angle at the dorsal organ. As in N. microps, 

 adult and subadult females have no latéral marginal denticles on 

 the carapace, in adult maies very small denticles are found, in 

 somewhat smaller spécimens of both sexes thèse denticles are 

 more conspicuous, while in spécimens measuring only 7-g mm 

 they are proportionately large. In adult spécimens of both sexes 

 the terminal joint of the elongate legs is furnished with 7 strong 

 spines, as in N. microps ; in small spécimens this number is 

 reduced. The largest female measures i7 mm , an adult maie i2 mm 

 in length. 



In adult females the rostrum is moderately short, somewhat 

 oblong triangular with the margins a little concave; in sub- 

 adult spécimens it is distinctly longer, with the margins more 



