159 



defined inferiorly l)y a sharp upturned denticle, below which sometimes occur 

 2 or 3 minute serrations. Antennae about as in H. fnmcota, but witli a smaller 

 number of articulations in the flagella. (luatliopoda likewise of a very simi- 

 lar structure, the posterior ones being considerably more powerful than the 

 anterior, with the tlniml>like j'l'ocess rather strong-. Penultimate pair of 

 pereiopoda extremely .slender and elongated, equalling in lengtli 'A of the 

 body; Ijasal joint of last pair with the posteri(U' expansion oblii{uely deflexed 

 and rounded, edge bearing long slender setae and liaving between tliem aliout 

 12 sejTations, the inferior of whicli are more or less distinctly bipartite. La.st 

 pair of uropoda witli the inner ramus scarcely exceeding half the length of 

 the basal joint of the outer; the latter with only 3 spines exteriorly; each 

 ramus tipjied by a single slender seta. Lobes of telson less diverging than in 

 //. Inmcdht and narrowly rounded at the tip. — Adult male rather like in 

 outer habitus that of H. neglecta and pectinata, but differing in the fuller 

 development of the oral parts, the structure of the gnathopoda, wliich nearly 

 agrees with that in the female, by the not-produced last pair of epimeral 

 plates of metasome, and by the outer ramiis of the last pair of uropoda being 

 considerald}' longer than the inner, f'olour greyisli white, pellucid. Length 

 of adult female scarcely exceeding 4 mm, of male about the same. 



Brmarls. — The description at first given by Boeck of this species, does 

 not full}' correspond with Jiis figures, and it is most probable therefore, that he 

 has confounded it with another species, perhaps the form described above as 

 H. prcfina/a. As liowever the figures subsequently given in liis great work on 

 the northern Amphipoda undoubtedly relate to the present species, the specific 

 name nrmilala at first proposed ouglit to be retained for this form. The 

 species maj- be readily distinguished by the great length of the penultimate 

 pair of pereiopoda, the peculiar shape and armature of the ba.gal joint 

 of the last pair, and by the form of the last pair of epimeral plates of the 

 metasome. 



Occurrence. — Off the soutli and west coast of Norway, this species 

 is by no means rare, occurring, together with H. neglecta and pectinafa, in 

 depths varying from 30 to 100 fathoms. I have also collected it rather 

 abundantly in tlie Troudhjemsfjord, and Mr. Schneider has found a single 

 specimen in the neighbourhood of Tromso, Finmark. 



Dktrihution. — Kattegat (Meinert); coast of Bohuslan (Stockholm 

 Museum). 



