Genus— GRAYIA. 



Grayia. Spence Bate, Cat. Ainpli. Crust. Brit. Mus. p. 101. 



Generic character. Cephalou anteriorly produced. Eyes 

 two. Superior anteunae 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 whicli 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 Darwlnia, it differs generically 

 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. 



