GKAYIA. 
151 
A MP HIP 0 DA . PH OXIDES. 
NATATORIA. 
Genus— GRAY! A. 
Orayia. Spence Bate, Cat. Amph. Crust. Brit. Mus. p. 101. 
Generic character. Cephalon anteriorly produced. Eyes 
two. Superior antennae without a secondary appendage. Gna- 
thopoda subchelate. Pereiopoda subequal. Posterior pair of 
pleopoda biramous. Telson squamiform. 
The head is only moderately produced in front, and 
does not terminate in a point. The eyes are two, one on 
each side of the head, in the normal position of those 
organs. The superior antennae are not furnished with a 
secondary appendage. The inferior antennae are not so 
robust as the superior. The three posterior pairs of 
walking legs are strong and subequal in length, and 
terminate in sharp-pointed fingers. The last caudal 
appendage is double-branched, and the middle tail-piece 
is squamiform and apparently simple. 
We consider this genus to bear a close affinity to 
Odiceros Kr., from which it is distinguished by the 
shortness of the last pair of the walking legs, which, 
in this genus, are not longer than the preceding pair. 
The animal possibly may be parasitic ; but if it pos- 
sesses similar habits to Darwinia, it differs genericallv 
in the size of the arms, the form and depth of the coxae, 
the less dilated character of the body, and the absence 
of the unusual character of the third segment of the 
tail being considerably less deep than the second. 
This genus is named in compliment to Dr. J. E. Gray, 
F.R.S., &c., the indefatigable keeper of the Zoological 
Collection of the British Museum, to whose zeal its pre- 
sent efficient state is mainly owing. 
