152 
GAMMARIDiE. 
A MPHIP ODA . PH OXIDES. 
NATATORIA. 
GRAYIA IMBRICATA. 
Specific character. Three anterior segments of the pleon posteriorly 
elevated. Eyes large. 
Length, 5 4 g inch. 
Grayia imbricata. Spence Bate, Cat. Amph. Crust. Brit. Mus. p. 101, 
pi. xvi. tig. 4. 
The head is anteriorly produced, and rounded in 
front, but not extending to a point. The three seg- 
ments of the anterior part of the tail are each posteriorly 
raised, giving, when viewed laterally, an imbricated ap- 
pearance to the dorsal margin, a circumstance that 
suggested the specific name of the animal. The eyes 
are rather large, tolerably round, and very black. The 
superior antennae are not longer, but stouter, at the base 
of the peduncle than the inferior. The inferior are more 
slender and less tapering than the superior, and equal in 
length to the head and the first three segments of the 
body. The coxae are not so deep as the body, and the 
four anterior are equal in size. The first two pairs of 
legs are subchelate ; the hands are subovate, the palms 
