202 LIVERPOOL BIOLOGICAL SOCIETY. 
two smaller spines. Second joint short and terminated 
anteriorly by a similar group of spines. Third joint 
produced downward for about one-third the length of the 
fourth, the lobe thus formed being crowned with a double 
spine and the hind margin having three strong spines. 
The remaining joints are somewhat variable in length and 
armature in different specimens. 
All the perzeopods have the third joint produced. 
Uropops: First pair projecting beyond the others ; 
peduncle longer than rami, both spinous. Second pair 
projecting as far as the third, spinous as the first. Third 
pair with the peduncle longer than the rami, widening 
suddenly at the proximal and tapering slightly towards the 
distal end; it has three small spines on the upper margin. 
The rami are round, the outer slightly the longer, the 
inner with two minute spines. There are no hairs (sete) 
of any kind on the uropods. 
TELSON concave, entire, quadrate, with the side curved; 
hinder margin straight. 
LENGTH 10 mm. 
The integument is hard, and horny both in colour and 
texture—hence the specific name, from xep¢rives, horny. 
I.b. A-single female specimen of the same species as 
those recorded in Report I. as L. costw, and corrected in 
Report II. to L. longicornis, Lucas. Neither of these 
appears to be correct, as far as it is possible to judge from 
females only, no male having yet been taken in our district. 
Stebbing (‘‘Challenger”’ Report) shows that Lysianassa 
was already preoccupied in the Mollusca and substitutes 
Lysianax. I include the present species in the genus in 
spite of the uropoda not being ciliated, which I submit is 
scarcely a fit generic character. The squamiform entire 
telson, and the conical propodos of the first gnathopod 
with apparently immoveable dactylos, are such marked 
