ty 
ete eo 
A. HYPERIID. 
whole of this division of Amphipod Crustacea. The 
walking legs are nearly of similar length, but have the 
coxze, especially of the two anterior pairs, not so deep 
as in the Gammarina, and the thighs less broadly de- 
veloped. The natatory appendages possess no con- 
spicuous distinction from other Amphipoda, but the three 
caudal pairs have the peduncles broad and flat, and the 
rami sharp and triangular. ‘The middle piece is small, 
triangular, and squamiform. 
The geographical distribution of this genus appears 
to be world-wide, since it has been observed in the 
Atlantic as well as the Indian and Pacific Oceans, from 
the arctic to the tropical latitudes. 
