1490 THE VOYAGE OF H.M.S. CHALLENGER. 



of its sharply produced hinder apex, which has a notch with a cilium on the front or 

 inner side ; the hand has a similar but smaller process, the tip of which does not reach so 

 far as the distal end of the front of the hand ; the finger is small, strongly curved, with 

 a cilium on the inner margin. 



Second Gnathopods with all the joints larger than those of the first pair ; the first 

 joint considerably longer, bent ; the second joint with a spinule or bristle a little above 

 the hinder apex ; the third joint distally widened, the hind margin very finely pectinate, 

 with a bristle some way above the rounded apex ; the wrist with three or four little 

 setules on the surface near the somewhat sinuous finely pectinate hind margin, which 

 is drawn out into an acute process reaching beyond the very small process of the 

 hand, almost to its extremity ; the hand about as long as the third joint, and about half 

 its breadth. 



First Perasopods. — First joint closely resembling that of the second gnathopods ; 

 second joint longer than broad; third about as long as the fourth, fifth longer than either, 

 slender ; finger slender, curved, about a quarter as long as the preceding joint. 



Second Perseopods like the first, but with the fourth and fifth joints decidedly 

 longer, the fourth longer than the third ; the armature in both pairs of the slightest 

 description. 



Third Perasopods. — First joint an elongate oval, with flattened sides, not so long as 

 the remaining joints together; the third joint scarcely longer than the fourth, but shorter 

 than the fifth, these three having the front margin minutely pectinate; in the fourth joint 

 the pectination is continued round the apical margin ; the fifth joint is shorter than that 

 of the second perasopods. 



Fourth Perseopods.— -The first joint very much larger than in the preceding pair, of 

 irregular outline, broadest distally, with a large ear-shaped groove on the surface ; the 

 remaining joints by comparison insignificant, the second attached low down within the 

 hind margin, the third about twice as long as the fourth, widening a little towards 

 the slightly produced apex, pectinate along the front margin with nearly forty slightly 

 retroverted teeth ; the fourth joint similarly produced and pectinate with about a dozen 

 strong teeth, besides some minute ones near the base ; attached behind the obtuse front 

 apex of the fourth joint is a rudimentary fifth joint with a little blunt rudimentary finger, 

 the two together not reaching the end of the process of the fourth joint. 



Fifth Perasopods feeble ; the first joint slender, curved, having at the tip a little 

 diminutive wrinkled representative of the following joints, which perhaps disappears at a 

 later stage, as it is not indicated in Claus' figure. 



Pleopods. — Peduncles produced downwards at the inner angle ; the coupling spines 

 minute, with an apical pair of hooks ; cleft spine apparently with both arms to some 

 extent dilated ; inner ramus with five, outer with six, joints. 



Uropods and acutely pointed Telson in close agreement with Claus' figures. The 



