1242 THE VOYAGE OF H.M.S. CHALLENGER. 



curved and widening a little distally, carrying three slender unequal spines ; the third 

 joint distally tapering, on the inner margin of this part carrying a row of about 

 eighteen short spines, and at the apex a long pectinate spine, with a short stout one 

 beside it on the outer side ; it also carries three spines on the outer surface at the 

 other end of the row, two that are long and pectinate, and a shorter one. 



Lower Lip. — The principal lobes wide apart, not very broad nor strongly ciliated ; 

 the inner lobes rather broad, occupying much of the vacant space between the 

 principal lobes ; the mandibular processes small and narrow. 



First Maxillse. — The inner plate seems to be entirely wanting ; the outer plate 

 has seven spines on the apex, of which the innermost are more or less minutely 

 denticulate, the outer three appear to be almost smooth ; the first joint of the palp is a 

 little longer than broad, its outer margin longer than the inner ; the long second joint 

 much overtops the adjacent plate, and on a strongly dentate apex carries four spine - 

 teeth, and has a couple of setiform spines on the surface below these. 



Second Maxillw. — The inner plate broader and shorter than the outer, with some 

 eight or nine setiform spines on the oblique apical border ; the outer plate with the 

 like number round its apical border, the chief part of which slopes outwards, while that 

 of the inner plate slopes entirely inwards ; the spines on these plates are scarcely 

 plumose. 



Maxillipeds. — The inner prismatic plates very small, scarcely reaching beyond the 

 base of the first joint of the palp ; the apex of the inner margin projects a little, the 

 apical border carrying a little imbedded spine-tooth and two curved setiform spines, 

 two larger setiform spines being on the inner surface not far from the apex ; the outer 

 plates are a little longer and reach a little beyond the first joint of the palp, with the 

 inner margin straight, the outer convex, the armature consisting of a row of four or five 

 spines spaced along the outer surface, and two marginal spines in notches, one on either 

 side of the apex ; the first joint of the palp short, with two slender spines on the inner 

 margin ; the second joint the longest, with several spines on and near the inner margin, 

 the third joint rather longer than the first, with numerous spines about the slightly 

 widened apex ; the fourth joint as long as the third, curved, the inner margin pectinate, 

 the dorsal cilium close to the hinge. 



First Gnathopods attached close to the maxillipeds ; the first joint much longer 

 than the hand, narrow at the point of attachment, the front margin straight ; the 

 second joint a little longer than wide ; the third rhomboidal, with a narrow neck, 

 having a group of spines on the surface near. the front and another at the lower angle 

 behind ; the wrist longer than the third joint, as long as the hand, widening distally 

 from a narrow base, set with numerous spines on the surface and round the hinder and 

 apical margins ; the hand irregularly oval, the surface set with numerous groups of 

 spines ; the hind margin much shorter than the front, the difference being made up 



