954 THE HON. P. A. METHUEN ON 



slightly in individual length ; between the eighth seta of this 

 series and the middle portion of the palp are placed three fairly 

 long setfe, of which the central is the longest. The dactylos, 

 which is slightly curved, is provided with two setpe on its anterior 

 and four very short setfe on its posterior margin ; this inner 

 margin bears distally a small tooth distinct from the long 

 curved terminal unguis ; between these two lie two small setee. 

 None of the setae on the ultimate and penultimate joints are 

 serrated. 



Gnatho2)od II. (PL LI. fig. 10) is very like gnathopod I. Only 

 the chief differences will be mentioned. The setae on the second 

 joint are somewhat different in disposition and in length. The 

 third joint is somewhat longer and narrower and possesses more 

 setae. The fourth joint has fewer setae and only one fairly dense 

 group of about ten setae. The fifth joint is three-quarters as 

 broad as long (the same measurements in gnathopod I. show the 

 breadth to be greater than the length) ; the anterior and posterior 

 margins are comparatively long, the former the longest ; the setae 

 on the posterior margin are longer and more numerous and are 

 arranged in seven or eight groups. The sixth joint has, on the 

 anterior part, an additional group of fairly long setae, which vary 

 in number in each group : the whole joint is longer and narrower: 

 the palm does not difier much, but the proximal half of the pos- 

 terior margin bears eight groups of long feebly serrated setae, 

 between which and the palm lie five finger-shaped processes, one 

 conspicuously longer than the rest with another little one at its 

 base. The dactylos and terminal unguis spine are both shorter ; 

 between the latter and the small terminal tooth thei^e are no 

 setae. 



Pereiopocl I. (PI. LI. fig. 11) : the coxa of the first joint is 

 almost rectangular ; the anterior and ventral margins are, 

 however, somewhat concave, the middle part of the posterior 

 margin slightly convex ; the anterior margin has four short setae, 

 the ventral three. The second joint is long, narrow at the 

 proximal base, whence it widens rapidly but nowhere greatly, 

 being never more than a quarter as broad as long ; nine spines of 

 moderate length and seven spines of greater length arm its 

 anterior and posterior margins respectively ; further, a group of 

 four setae are placed at the distal extremity of the posterior 

 margin. The third joint is a little longer than that of the 

 gnathopods but is considerably narrower ; its posterior margin 

 carries a group of four setae distally. The fourth joint is long, 

 longer and broader than the fifth, the two joints together about 

 the same length as the second joint : the anterior margin carries 

 three setae unequal in length — at the base of the longest a minute 

 seta can be seen — and distally a group of three setae, one of which 

 is long ; the posterior margin bears three groups of three setae 

 each, then one short seta, then distally a group of three setae. 

 The fifth joint, which is equal in length to, but broader than, the 

 sixth joint, carries on its anterior margin two minute setae, and 



