REPORT ON THE AMPHIPODA. 1291 



Eyes not made out. 



Upper Ante una'. — First joint of the peduncle broader than long, the two following 

 joints together as long as the first, and each nearly as broad ; the first joint of the 

 rlagelluru longer than the peduncle, having some slender filaments along the inner 

 margin ; the minute second joint abruptly narrower than the apex of the first, not 

 embedded in that apex, a little longer than broad, with some apical spinules, the third 

 joint narrower than the second, a little longer, with four apical spinules. 



Lower Antennas not half the length of the upper, close beside which they are planted, 

 the first two joints, which may be supposed to represent the peduncle, not being together 

 so long as the third which represents the flagellum, and is tolerably stout, tapering, 

 tipped with a setule. 



Upper Lip pretty strongly ciliated or furred on the distal margin. 



Mandibles. — The cutting plate very small compared with the broad trunk, the edge 

 divided into ten or more small but sharp teeth ; the secondary plate of the left mandible 

 with about eight teeth along its broad edge ; the secondary plate of the right mandible 

 strap-shaped, with three or four apical teeth ; behind the plates there is a group of cilia 

 or hair-like spines, among which there are three stouter spines, the first large, distally 

 pectinate ; the molar tubercle is prominent, its crown set wdth very many little teeth, and 

 an outer row of fairly long ones ; the palp in the present specimen seemingly not 

 fully developed, its first joint quite short; the second a little longer; the third rather 

 longer than the first and second together, apically blunt. 



First Maxillss. — Inner plate small, oval ; the outer plate not quite so large as the 

 palp, distally set with seven spines among a crowd of spinules ; the palp apically narrow, 

 with slender spinules along the margins of the distal part, some at the apex a little 

 less slender than the rest. 



Second Maxilla; short, the inner plate shorter and apically broader than the outer. 



Maxillipeds. — The inner plate broader than long, the convex distal margin a little 

 serrate and crenulate, with two minute spinules embedded at the centre ; the dentation 

 of the margin in the new growth is seen to be much sharper than in the plate actually 

 in use ; the outer plates have the outer margins convex and smooth except for two 

 little spines near the apex, the inner margins are to some extent concave, the middle 

 part denticulate and carrying little spines, the distal part crenulate and pectinate ; there 

 are four or five small spines on the inner surface of each of the outer plates, and four on 

 the inner surface of the joint below the plates. 



First Gnathopods. — First joint a little sinuous ; second short, like the first smooth 

 and unarmed ; third scarcely longer than the second, with one apical spine, which, however, 

 is present only on one of the limbs ; the wrist distally widening, broader and a little 

 longer than the hand, with one apically plumose spine on the channelled apex of the hind 

 margin ; the hand with smooth convex front margin, the hind margin straight, with a 



