21 



Remarks. This species is easily distinguishable from the preceding one 

 hy the much shorter and more robust form of the, body, the acutely produced 

 pseudorostral projection, and the absence of the oblique lateral folds on the cara- 

 pace. Moreover, the 2nd pair of legs and the caudal appendages exhibit well 

 marked differences, and the colour is also different. Finally, the adult male 

 is well characterised by the peculiar structure of the inferior antenna, the prehen- 

 sile nature of which is more pronounced than in any other known Cumacean. 

 Of this species also I have succeeded in preserving specimens of the 2 sexes still 

 locked together in copulation. The mode in which the female is grasped by the 

 male is exactly as in the preceding species. 



Occurrence. This species seems to be a true arctic form, as I have 

 never met with it off the south and west coasts of Norway, whereas in the arctic 

 region it is very common, from the Lofoten Islands to Vads0. It is generally 

 found in places similar to those in which the preceding species occurs. 



Distribution. -Greenland (Hansen), Franz Joseph Land (Th. Scott). 



Gen. 2. HemllamprOpS, G. 0. Sars, 1882. 



Generic Characters. Body, as a rule, very slender, with the anterior and 

 posterior divisions generally less sharply marked off from each other. Carapace 

 not very large, without any subrostral sinus, the antero-lateral corners being quite 

 obsolete, pseudorostral projection more or less distinct. Eye well developed or 

 wanting. Superior antennae with the flagella comparatively longer than in Lam- 

 props; inferior antenna? in male normally developed. 1st pair of legs slender and 

 elongated, with the terminal part much longer than the basal joint; 2nd pair 

 likewise slender. 3rd pair in male more or less transformed. 3 pairs of well 

 developed pleopoda present in the male. Telson and uropoda of a similar struc- 

 ture to that in Lamprops. 



Remarks. This genus was proposed by the present author in the year 

 1882, to include some species formerly referred by him to the genus Lamprops, 

 but materially differing in the sexual characters of the adult male. Otherwise 

 the 2 genera are closely related, exhibiting the very same structure of the ter- 

 minal caudal appendages. The genus comprises, as yet, 5 species, one of which, 

 H. Normani, has recently been recorded by M. Bonnier from the Gulf of Gas- 

 cogne, the 4 others belonging to the Norwegian fauna. 



