23 



Remarks. This form also is closely allied to the type species, though 

 easily distinguishable both from it and from the preceding species by the 

 comparatively more compact form of the body, and more particularly by the 

 structure of the caudal rami and of the last pair of legs. 



Occurrence. Only a solitary female specimen of this form has hitherto 

 come under my notice. It was taken last summer at Hval0r, outside the Chri- 

 stiania Fjord, from a depth of about 20 fathoms, muddy bottom. 



Fam. Ectinosomidae. 



Gen. Ectinosoma, Boeck. 



Remarks. This genus seems to be exceedingly rich in species. To 

 the 13 species described in Vol. V I am now enabled to add 8 more, the 

 number of Norwegian species thus arising to no less than 21 in all. The 

 determination of these species is, however, in some cases not easy on account 

 of the rather uniform outward appearance of the body, and the anatomical 

 examination is moreover rendered rather difficult by the glossy and tough 

 integuments and by the smallness and fragility of some of the appendages. 

 The most reliable distinguishing character is derived from the structure of the 

 last pair of legs, which is perfectly constant and in nearly every case exhibits 

 some peculiarity characteristic of the species. 



14. Ectinosoma proximum, G. O. Sars, n. sp. 

 (PI. XV, fig. 1). 



Specific Characters. Female. Very like E. neglectum G. O. Sars, as 

 to the general form of the body, but of somewhat smaller size. Rostral plate 

 slightly prominent and, as seen dorsally, obtusely truncated at the end. Uro- 

 some somewhat shorter than the anterior division and gradually tapered behind; 

 anal segment scarcely more than half as long as the preceding segment and 

 deeply incised behind in the middle. Caudal rami somewhat divergent, and 

 almost twice as long as they are broad at the base; apical setae of moderate 

 length. Anterior antennae comparatively rather short and stout, being apparently 

 only composed of 5 joints densely clothed with strong curved setae. Posterior 

 antennae, oral parts, and natatory legs exhibiting a structure very similar to 



