153 



AMPHIPODA. 



NA TA TORI A. 



GAMMARlDiE. 



PIIOXIDES. 



GRAYIA IMBRICATA. 



Specific character. Tliree anterior segments of the pleon posteriorly 

 elevated. Eyes large. 

 Length, ^^ inch. 



Grayia imbricata. Spence Bate, Cat. Amph. Crust. Brit. Mus. p. 101, 

 ])1. xvi. fig. 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 paii's of 

 legs are subchelate ; the hands are subovate, the palms 



