88 
GAMMARIM. 
the wrist gradually tapers to the distal extremity, where 
it supports a short straight finger. The appendage is 
hut scantily clothed with hairs. The second pair of legs 
are long and slender, having the wrist twice as long as 
the hand, with the inferior margin convex and the su- 
perior straight, the widest part being near the middle of 
the joint ; the hand gradually hut slightly increases in 
diameter to the extremity, where the inferior angle is 
produced in advance of the palm, and thus gives the 
part a nearer approximation to a chelate organ than is 
common in this order of Crustacea. The upper margin 
of the hand to the apex is thickly furnished with long 
double-branched hairs, the lower margin is studded with 
straight parallel hairs, and the inferior angle covered with 
short thick spines or obtuse hairs, very minute. The fin- 
ger articulates near the centre of the extremity of the 
hand, and is short, sharp-pointed, and curved. The 
walking legs are subequal, and do not materially differ 
from those of other species of this genus. The two pen- 
ultimate pairs of caudal appendages are styliform, and 
have the branches subequal in length, the upper margins 
being furnished with a few short hairs. The last pair 
reaches much further posteriorly than the two preceding, 
but the basal joint is very short, while the branches are 
long, subequal, and thickly furnished with long plumose 
cilia. The central tail-piece exhibits no peculiar character. 
The colour of the animal, when fresh taken, was 
bright orange, mottled with red spots along the sides of 
the body, just above the legs. The specimen from which 
our drawing is taken was dredged by us in Plymouth 
Sound, and described under the name of Lysianassa 
chausica , being under the impression that it agreed with 
Edwards’ description of Alibrotus chausicus; but through 
the kindness of the authorities at the British Museum, 
