8 



so in the 2nd, propodal joint in both pairs oval in form, scarcely serrate along 

 the inner edge, but all over densely spinous, dactylns very small. The 2 

 anterior pairs of pereiopoda having fascicles of short bristles along the 

 posterior edge. Urepoda almost exactly as in H. yalba. Colour dark purplish 

 brown from numerous pigmentary spots distributed over the whole body as 

 also on the limbs. Length of adult female 15 mm. 



Jiruuirks. I think Dr. Bovallius is right in believing the form 

 described by Boeck under the name of Hyperia spinipes to lie most likely 

 identical witli the Cancer mcdnsarum of 0. Fr. Miiller, and hence the latter 

 specific denomination ought to be retained for the present form. Although 

 in its general habitus very like the preceding species, this form may at once 

 be distinguished, on closer examination, by the rather different form and 

 armature of the gnathopoda, a character which suggested the specific name 

 of spinipes proposed by Boeck. 



Occurrence. West coast of Norway, found parasitic on Cyanea, 

 occasionally also on Awclia, but less frequently than the preceding species. 



Distribution. - - Arctic Ocean: Greenland and Spitsbergen. 



Gen. 2. Hyperoche, Bovallius, 1887. 

 Syn : Metoecus Kroyer, Tnnria Boeck. 



Form of body about as in Hyperia, but with the cephalon somewhat 

 more regularly rounded. Inferior antennae in female much smaller than the 

 superior ones; both pairs in male greatly elongated. Mandibles with the 

 molar expansion narrow lanceolate and unarmed. First pair of maxillae 

 having the palp very broad and lamellar. Grnathopoda subsimilar, both 

 distinctly ch elate, the carpal joint being produced inferiorly to a compressed 

 knife-like process reaching to the end of, or beyond, the propodal joint, and having 

 the inner edge finely serrate; propodal joint narrow, attenuated, with the 

 inner edge serrate; dactylus rather short, The two anterior pairs of pereio- 

 poda having the carpal joint slightly expanded and compressed; posterior 

 pairs subequal. Uropoda and telson about as in Hyperia, 



Remarks. - The generic name Metoecus of Kroyer having been em- 

 ployed in Zoology at an earlier date, Dr. Bovallius has proposed a new 

 generic denomination, viz., Hyperoclie. The same author has likewise shown 

 that the northern form cannot properly be referred to the genus Tanria of 

 Dana, as suggested by Boeck. The genus is easily recognised by the peculiar 

 structure of the gnathopoda. Otherwise it comes rather near to Hyperia, 

 though differing also somewhat in the structure of the oral parts. Dr. Bo- 



