EURYSTHEUS ERYTHROPHTHALMUS. 
855 
are rather more than half the length of the animal, and 
are placed at the extreme front of the head ; the first 
joint of the peduncle is as long as the head, and more 
stout than the second and third, but not quite so long ; 
the flagellum is about half the length of the peduncle ; 
and the secondary appendage is rather more than half 
that of the primary. ‘ The inferior antennae are a little 
shorter than the superior ; the peduncle reaching nearly 
as far as the peduncle of the superior. The first pair of 
legs have the hand small, with the palm oblique. The 
second pair have the wrist as long as, and continuous* 
with the hand, the inferior margin of which is furnished 
with several fasciculi of hairs ; the palm is concave, very 
oblique, and armed with three short points or teeth 
(that is, two equidistant from each other, and from the 
third, which defines the limit of the palm). The other 
legs are nearly of equal length, and are rather long and 
slender, they increase a little posteriorly, and the last 
three pairs have the coxae less deep than the first four ; the 
thighs are much dilated, and the distal extremity of the 
penultimate joints posteriorly tipped with a small bundle 
of long hairs. The caudal appendages are uniform, and 
nearly of the same length, the penultimate pair being 
rather the shortest ; they are biram ous, the peduncle 
carrying at the extremity a strong spine, and the 
branches having the posterior surface furnished with 
short stiff spines ; the central caudal termination is 
cylindrical, tipped with a solitary hair. 
This interesting form of Amphipod (of which we feel 
some doubt as to the present being its most natural 
position, relative to the other animals of the order) has 
* By the expression that the wrist is “continuous” with the hand, we 
mean that the outline of the former is in close continuation with that of the 
latter, so that they appear as a single joint. 
A A 2 
