284 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



palm almost transverse, concave and denned by an angular 

 prominence, a double tooth in the centre and a larger one 

 at the base of the dactylus, across which it projects a 

 pointed lobe on the outer side. The carpus expands 

 distally till it is as wide as the hand. The posterior 

 margins of both are densely setose. 



Perceopods strong, the 4th and 5th of equal length, 

 their first joint broad at the base and narrowing distally, 

 the hind margin slightly serrate. 



Uropods all reaching about the same distance behind, 

 the peduncle of the third pair nearly as long as the rami, 

 which are equal and spinous. 



Telson reaching to less than half the length of the 

 peduncle of the last uropods, widely but not deeply cleft, 

 a spine and a seta at the end of each division. 



Colour yellowish, densely freckled with grey on the 

 back, and with darker spots on the 1st joints of the 

 peraeopoda. 



The equal upper and lower antennae, the comparative 

 shortness of the last uropoda, and the length of the wrist 

 in the 2nd gnathopods are obvious distinctive characters 

 of this species. 



Family PhotibvE. 



Aoroides, n. gen. 



Characters (of female) as in Microdeutopiis and Aora, 

 except as follows : — 



Mandibular palp very slight and without setae, except 

 3 at the tip of the last joint and 1 near the end of the 

 penultimate ; these two joints sub-equal, 1st joint very 

 short ; cutting edges of mandible 4-toothed. 



Upper antennae without even a rudimentary accessory 

 appendage. 



