564 CARL BOVALLIUS, ARCTIC AND ANTARCTIC HYPERIDS. 
serrated. Also the carpi of the third and fourth pair are dif- 
ferent in form, with serrated hinder edges, or dilated as in the 
genera Parathemisto and HFuthemisto. "The general habitus is 
very similar to that of Hyperia. 
1. Hyperoche Kroeyeri, C. Bovallius, 1885. 
Syn. 1838. Metoecus medusarum. Kroeyer. Grgnlands Amfipoder. Det 
K. Danske Vidensk. Selskabs 
nat. og math. Afhandl. Deel 
0, PER 60; PISA 
1862. Hyperia medusarum. O. Fabr. Catalogue of the specimens of 
Amph. Crust. in the collmot 
the Brit. Mus., p- 295. 
1870. Metoecus medusarum. > A. Boeck. Crust. amph. bor. et 
ALGEFEPENOE 
1872. Tauria medusarum. > A. Boeck. De skandinaviske og 
arktliske Amphipoder, p. 82. 
Christiania, 4:to. 
1885. Hyperia Kroeyeri. CO. Bovallius. »On some forgotten genera 
among the Amphipodous Cru- 
stacea.> Bih. t. K. Sv. Vet.-Ak. 
Etandl:; BA-T0R Nor SpSete 
H. Kroeyeri is characterized by the slender form of the 
body and the elongated last three pairs of pereiopoda; in gene- 
ral habitus it comes nearest to H. prehensilis, Spence Bate 
and Westwood, and resembles a Parathemisto in the form 
of the carpi of third and fourth pairs of pereiopoda. "The 
peculiar shape of the first two pairs shows however that it 
must be ranged in the genus Hyperoche. 
Length 7—25 mm. (Kroeyer. 
Hab. Greenland. 
2. Hyperoche abyssorum, A. Boeck, 1870. 
P1. 44, fig. 55—062. 
Syn. 1870. Metoecus abyssorum. A. Boeck. Crustacea amphipoda borealia 
et arellCANNpsLOS 
1872. Tauria > > De skandinaviske og arktiske 
Amphipoder, Pp. Sd, pl-li1oes 
It differs from the preceding species by the linear broad 
carpi of third and fourth pairs of pereiopoda, and by the carpal 
process of the second pair being almost as long as the meta- 
carpus and dactylus together. The peduncles of the last pair 
of uropoda are three times longer than telson. 
Length 5 mm. 
Hab.:IINNyest coast ofrofi Norways (BS: NE) 
