1280 THE VOYAGE OF H.M.S. CHALLENGER. 



the first two spines are furcate or tridentate, and though not longer are stronger and 

 more horny-looking than the rest, which include four of moderate length and two or 

 three that are very short ; there is also a group of almost hair dike spines ; the molar 

 tubercle is strong, with numerous sharp teeth round the oval crown ; the long palp has 

 the first joint longer than broad, a little widened distally, the second joint narrower but 

 much longer, much curved, the front margin convex, the hinder very concave ; the 

 third joint thinner and longer than the second, curving in the opposite direction, at first 

 narrowing and then widening again slightly, its concave front margin almost smooth, the 

 convex hinder margin furred, except near the base, with many small spines ; the apex 

 forming an acute point. 



Lower Lip. — The outer corner of the distal margin of the principal lobes prolonged 

 into a tooth, the slightly convex distal and outer margins on either side of this tooth 

 fringed with cilia ; the mandibular processes as usual in this genus with the ends scarcely 

 free. 



First Maxillse. — Inner plate small, oval ; outer plate with numerous slender spines on 

 the distal part, the distal margin not very broad, with (not fewer than) eight stout spines, 

 of which the outermost are the longest, some having lateral denticles, the outermost but 

 one the strongest, but without denticles ; the palp consists of a single joint, narrower 

 than the base on which it stands, reaching a little beyond the outer plate, having long 

 slender spines on its margins, and on the narrow apex a group of unequal spines rather 

 stouter than the rest. 



Second Maxillse short. The basal part with very convex outer margin, the inner 

 plate much narrower than the outer, curved, apically narrowed, with spines along the 

 distal part of the outer margin and at the apex, besides many hair-like spines in other 

 parts ; the outer plate short and broad, the outer margin carrying many hair-like spines, 

 except at the base, apically produced into a rounded point, which is tipped and flanked 

 with many spines ; the inner margin and inner part of the distal margin are united by a 

 curve and appear to be smooth. 



Maxillipeds. — 'The inner plate, of which the length and breadth are about equal, 

 has a convex distal margin divided into five flat-topped teeth in the centre, the three 

 central scarcely distinct from one another ; the flat teeth are followed on either side by 

 five sharp denticles, the first two forming a single tooth, the other three separate ; the 

 inner surface shows five spinules down the centre, not symmetrically arranged, and a 

 great many scattered cilia ; the outer plates are much longer than broad, with three or 

 four spinules not symmetrically arranged on the convex outer margins ; the inner 

 margins dehiscent till near the convex distal part, irregularly cut into several sharp 

 teeth, with one small spine or sometimes two inserted at the base of the tooth, but not 

 quite reaching its apex ; on the convex distal part the teeth and spines are small and 

 crowded together ; seven or eight denticles overlap one another on the apical part of the 



