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



Second Maxilla. — Inner plate much shorter and narrower than outer, fringed from the 

 apex half-way down the inner margin with spines decreasing in size as they recede from the 

 apex, and with plumose setje the longest of which are beyond the shortest of the spines ; 

 outer plate fringed with rows of long and short spines from the apex far down the inner 

 margin, the longer spines curved at the tips. Both plates have their inner edo-es 

 comparatively straight, the outer much curved, their surfaces and inner edges much 

 ciliated ; the outer plate has also a row of small spines from the ap)ex down a small 

 portion of the outer margin. 



Maxillipeds narrow. The inner plates not reaching the distal end of the first joint 

 of the palp, widening distally, apical border much excavated and forming a projection 

 at the inner corner, which is set with three broad scarcely prominent teeth, just below 

 which on the outer side of the inner margin are two small spines ; long jilumose setae 

 occupy the inner margins, passing over into shorter ones on the distal margins. The 

 outer plates are long, reaching just to the distal end of the second joint of the palp ; the 

 lower part of the joint to which they belong is fringed wdth spines on the inner margin, 

 but this margin of the plate itself is clear of spines, being indented and in each indent 

 carrying an almost rounded tooth, which scarcely projects beyond the margin ; some 

 way within the border are small spines, rather less numerous than the teeth. It would 

 not be unnatural to suppose that the marginal teeth had been rounded by wear ; but 

 those of the new growth, not yet exposed to wear and tear, exhibit the same shape and 

 position. On the apical portion of the rounded outer margin there is a row of five small 

 spines, almost adprcssed to the margin. The second joint of the palp is considerably the 

 longest ; hke the first and third it is at the outer apex and along the inner edge fringed 

 with long spines or setae, wdiich, except for the terminal accessory thread, seem to be 

 quite smooth. The fourth joint or finger is not of any unusual length. 



First Gnathopods. — Side-plates dilated below and curving forwards, broader though 

 less deep than those of the following segment. First joint not reaching beyond the side- 

 plate, fringed in front and on the lower hinder angle ; second joint subequal in length 

 to third, with some fine setse on the hinder margin ; third joint produced to a sharp 

 point below," furred behind, carrying groups of setse on both sides near the apex; wrist 

 furred behind, scarcely broader distally than the hand at its base, setse in groups at both 

 the lower angles, and a small group near the middle of the front margin ; hand narrowing 

 distally, so as at the extreme apex to be scarcely broader than the finger, furred on upper 

 part of hinder margin, with groups of setse along both sides of the front, and along the 

 hinder margin and palm ; that which may be considered the palm is slightly sinuous, 

 minutely pectinate, a region shorter than the finger, determined by a short blunt spine ; 

 finger curved, -with inner edge smooth, but for a tooth near the base of the nail ; a 

 spiuiform cilium arises in the neighbourhood of this tooth. 



Second Gnathopods. — First joint long, a little dilated below, much more lightly 



