REPORT ON THE AMPHIPODA. 1411 



Lower Lip. — The principal lobes distally squared and strongly ciliated ; the man- 

 dibular processes apically narrowed. 



First Maxillae. — The outer plate has the somewhat narrowed distal half enveloped in 

 spines, some of which are long and hair-like, others moderately slender, and some at the 

 apex stout, of various lengths, three of them conspicuously strong ; the one-jointed palp 

 is considerably larger than the adjoining plate, its outer margin convex, smooth till near 

 the apex, then a little serrate, a series of teeth and spines passing round the distal 

 margin, the inner corner of which is raised and truncate, occupied by a short broad spine- 

 tooth ; the nearly straight inner margin is serrate with numerous sharp teeth and 

 bordered with spines and spinules. 



Second Maxilla;. — The inner plate shorter and rather broader than the outer, both 

 distally beset with numerous spines of various lengths and thicknesses, and each having at 

 the apex one longer and stronger than the rest ; another strong one is planted a little 

 below the apex, this and the apical spine being longer on the outer than on the inner plate. 



Maxillipeds. — The inner plate is three-sided, long and narrow, the inner sides armed 

 each with an oblique row of slender spines, the apex truncate and having a small spine- 

 tooth on each of its slightly projecting corners ; the outer plates longer than the inner 

 one, not very broad, the outer margin convex, the inner a little concave, except near the 

 base, a little serrate, armed with several long spines besides numerous spinules ; the apex 

 not quite acute. 



First Gnathopods. — The first joint about as long as the third, fourth, and fifth 

 together, with spines round the hinder apex, a little channelled distally in front ; the 

 short second joint similarly armed ; the third joint a little longer than the second, with 

 straight hind margin, distal spines, and a moderately acute front apex resting on the 

 wrist ; the wrist longer and broader than the hand, the front margin slightly convex, 

 smooth, with submarginal spines, the hind margin serrate, fringed with spines, not 

 apically produced downwards, but projecting a little beyond the hand, the surfaces also 

 carrying some spines ; the hand with convex front margin, the front nearly straight, at 

 the middle finely pectinate, strongly at and near the apex ; there are several spines on 

 the surfaces, and one in general conspicuously projecting from near the middle of the 

 front margin ; the finger curved, a little more than half the length of the hand, the inner 

 margin strongly pectinate for the first half, more finely for much of the remainder. The 

 spines, at least as a rule, are finely pectinate. 



Second Gnathopods. — First joint not widened above as in the first pair, but longer 

 than in that pair, equal to the third, fourth, and fifth joints together ; the first and 

 second joints with spines round the apex behind ; the third joint much longer than the 

 second ; its distal margin, which is much higher up in front than behind, is almost 

 encircled with spines ; the front apex resting on the wrist is a little produced ; of the 

 wrist the proximal part is rather longer than the hand, the produced distal part rather 



