48 
ORCHESTIIDiE, 
parallel with the superior ; the wrist is short and in- 
feriorly produced. The second pair of legs are formed 
upon the same type, and are scarcely larger than the first. 
The walking legs are all short and stout, terminating in a 
sharp curved finger; the caudal appendages are very short 
and strong, and fringed with but few spines ; the terminal 
appendage is deeply cleft. 
The animal is not much compressed, and all the seg- 
ments of the body are uniform in length : a circumstance 
which enables it to roll itself into a more perfect sphere 
than Amphipods generally do — a fact by which it may 
readily be detected amongst a number of other species. 
We have never seen any of this individual species 
alive ; but in dead specimens the eyes lose all colouring 
matter. The antennae are short and slight, gradually de- 
creasing in diameter from the base, the first joint being 
the largest, the rest gradually smaller, and the articuli of 
the flagella lessen in the same degree, so that there is no 
decided distinction between their respective peduncles 
and flagella. 
The walking legs are all strong and short, the ante- 
penultimate being shorter than the two posterior. They 
are all furnished at the extremity of the foot with two 
stout spines, curved at the apex, and serrated on the 
sides facing the finger against which they impinge when 
closed ( k ). 
The animal generally is free from hairs or spines, some 
small ones, however, exist upon the 
antennse, and a few others may be 
: 
found upon the legs, short and some- 
,<■' ' >:•' ■/ 
; •: i : v ;‘-; : ^ vv 'V • ' 
what pyriform in shape, with the apex 
& ' > * 
cleft into two equal parts ( k r/ ). 
,W- • * •• p. *. I*#.-* V • • V* • ‘ .> 
The integument under the micro- 
, J 
scope shows the T-like mark peculiar 
