372 
GAMMARIDiE. 
the palm is oblique, and not clearly defined. The second 
pair are about the same size as the first, but the palm 
of the hand is less oblique and better defined. In the 
female the hands are rather shorter and more ciliated. 
Some of the hairs on the wrist of the first pair are 
fringed with cilia, while those on the wrist of the second 
pair are three-pointed, those on the hand are subapically 
furnished with a single cilium. The thighs of the last 
three pairs of legs are dilated, but the pqsterior margins 
are subparallel with the anterior. The last pair of 
caudal appendages are considerably longer than the two 
preceding pairs, and have one branch long, and one about 
one-quarter of the size of the other. * The central tail 
appendage has each division tipped with a bundle of 
spines of the same form, with the exception of one, as 
all the others on the tail ; this one is finer, and crowned 
with a small plumose brush. 
The structure of the skin, when viewed under the 
microscope, exhibits traces of its cellular origin ; it is 
also perforated by numerous round hol- 
lows or pores, and a quantity of minute 
finely -pointed equidistant cilia, arising 
from bulbs of a somewhat hour-glass 
form, that is, being larger at each ex- 
tremity than at the centre, as seen in the 
annexed figure. 
The colour of the animal is of an olive-green, deepest 
along the dorsal margin, and verging to a buff at the 
extremities. Sometimes in a large group, for they are 
* Burgersdyck (Annotationes, &c., p. 17) confounds this minute branch 
with the terminal central bifid tail-piece ; and, from want of specimens of 
the true G. marinus, supposes Leach to have erred in his description of the 
head of the present species. 
