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



prominent ; palp long, set just over the molar tubercle, both being far forward, first joint 

 of palp short, second with a row of eighteen spines on the upper part ; the third joint 

 widening a little from the base, then narrowing almost to a point, carrying a row of thirty 

 spines on the inner border; none were present on the outer border. 



Loiver Lip with the distal part of the forward lobes strongly furred, the lobes 

 seemingly dehiscent. 



First Maxillas.— Inner plate oval, rather broad, with two unequal plumose setee on 

 the rounded apex ; outer plate broad, not greatly elongated beyond the inner, apical 

 margin not confluent with the inner margin ; all the spines and their denticles of stout 

 structures, but especially the five or six of the upper row ; the palp with its second joint 

 remarkably dilated, both lateral margins convex but the outer much more than the 

 inner, the very broad apical margin set with nineteen spine-teeth, of which the outer two 

 are excavate on the outer side ; they are followed by a straight pectinate spine at the outer 

 corner, and a similar one is found at about the centre of the row of teeth but a little 

 below it. 



Second Maxillw. — Inner plate shorter than outer, the lower part very broad, distally 

 narrowing, its sinuous inner margin set with fifteen plumose setae, the apical margin set 

 with rows of spines of different sizes, the smaller seemingly smooth, the larger pectinate, 

 the stoutest of these being at the inner angle near to the setae ; the outer plate less broad 

 than inner, the outer margin so much folded over that it cannot be flattened out in 

 mounting for the microscope withoiit separating it from its shaft, the apex rather more 

 oblique than that of the inner plate, set closely with rows of pectinate spines. 



Maxillipeds. — The inner plates of very unusual breadth, projecting rather in advance 

 of the first joint of the palp, the plumose setae of the inner border being comparatively 

 short, numbering fourteen actually on the margin, the row being continued by shorter 

 ones passing over towards the outer apex ; the apical margin carrying three pointed 

 teeth followed by a row of several jiectinate spines ; the outer plates long, reaching 

 beyond the second joint of the palp, the straight inner margin smooth for some distance 

 from its base, then presenting a spine, at a short interval from which begins a close-set 

 series of eighteen shar]) teeth, succeeded at the apex by a nineteenth tooth and a curved 

 spine ; on the surface within the margin are eight small slender spines ; the second joint 

 of the palp is longer than the first ; the finger is as long as the third joint ; its inner 

 margin is pectinate, the short sharp nail accompanied by some short cilia ; the dorsal 

 cilium much nearer to the base of the finger than to the nail. In position these maxilli- 

 peds are by no means broadly flattened out, as represented in the Plate for the sake 

 of showing the details;^ the two halves fold boatwise upwards, when in situ; in the 



1 In regard to all the Plates it will be understood that figures intended to give the minute details are drawn from 

 dissections laid out as flat as possible with a view to examination under the microscope ; in regard to the figures of this 

 species that circumstance requires more than usually to be borne in mind. 



