1234 THE VOYAGE OF H.M.S. CHALLENGER. 



nearly straight, with a small tooth at the top, which is evidently liable to be worn down, 

 the remainder of the edge perhaps finely serrate ; on each mandible there are two plates 

 similar in form to the secondary plate of the right mandible, but successively smaller ; 

 these are followed by a group of backward curving spines, nine or more in number on 

 the left, perhaps less numerous on the right, mandible ; there does not appear to be any 

 dentate molar tubercle ; the first joint of the palp is about half the length of the second ; 

 the second, which has seven or eight slender spines distributed over it, is very little 

 longer than the third joint ; of this the front margin is clear for nearly the first half, 

 the remainder carrying a series of from ten to thirteen spines, one at either end being 

 more than twice as long as the rest ; the apex of the joint is acute. The figure which 

 Hoek 1 gives of the mandible of " Leptomera pedata," in many respects resembles the 

 mandibles just described, and a similar arrangement is observable in Caprellina longi- 

 collis, Nicolet, judging from a specimen sent me from New Zealand by Mr. G. M. 

 Thomson. 



Lower Lip. — The principal lobes pretty widely dehiscent, their rounded distal 

 margins finely ciliated ; the inner lobes large and prominent, distally rounded ; the 

 mandibular processes apically narrowed. 



First Maxillae. — Inner plate wanting or at most rudimentary ; outer plate carrying 

 six spines on the truncate distal margin, the innermost and three following pectinately 

 feathered, but not strongly, the two* outermost having each a strong lateral tooth on the 

 inner side and a very slight pectination of the margin near it ; the first joint of the 

 palp not longer than broad, the second long, with several pectinate spines on the denticu- 

 late apex, and setse or setiform spines along much of the inner margin. 



Second Maxdlee.- — The inner plate short, but a little broader than the outer, with 

 about fourteen slender spines round the apical margin, the series slightly descending the 

 inner margin ; the outer plate similarly armed, but with the margin less convex and the 

 spines very unequal in size, none on either plate being strongly feathered or pectinate. 



Maxillip>eds. — The inner plates not reaching the apex of the first joint of the palp> 

 having four setiform spines crossing the distal end of the outer surface, the apical border 

 concave, with two little teeth at its outer corner, a small spine-tooth inserted below the 

 inner corner, the margin itself near to this corner bearing an arrangement of three large, 

 closely-set spine-teeth, two with their serrate edges facing one another, the third and 

 largest intermediate, overlapping and out-topping the other two, with its serrate edge 

 facing outwards ; the distal part of the very convex outer margin is a little serrate ; the 

 basal part of the joint carrying these plate's rises on the outer surface to a divided apex, 

 each half carrying five setse in two sets ; the outer plates are smaller than the inner, and 

 reach just to the apex of the first joint of the palp, the inner margin serrate, armed 

 with setiform spines, the outer margin convex, smooth except for some microscopic 



1 CarcinoloRisches, Taf. viii. figs. 1, la, 1879. 



