1460 THE VOYAGE OF H.M.S. CHALLENGER. 



the front serrate with six distant teeth, of which the apical is the longest ; the second 

 joint a little longer than broad ; the third joint narrower than in the second perseopods, 

 straight, with three distant teeth on the front margin. The rest of the limb missing. 



Fourth Perseopods much larger than the third, but not as disproportionate as in 

 Li/cseopsis themistoides, Claus. Branchial vesicles little larger than the preceding pair, 

 scarcely half the length of the first joint, narrow at the neck, the remainder an oval, 

 broad at both ends. The first joint not much longer but much more widely expanded 

 than in the preceding pair, the front margin serrate in the same manner ; the second 

 joint a little longer than broad ; the third joint straight, three-quarters of the length of 

 the first joint, much longer than the fourth, the front margin serrate with eight or nine 

 teeth ; the hind margin smooth, except for a little apical setule ; the fourth joint with 

 the front margin divided into ten decurrent teeth, closely set ; the fifth joint slightly 

 curved, longer than the third, nearly as long as the first, the front margin slightly 

 concave, serrate with sixteen adpressed teeth, which near the apex become longer and 

 more distant than higher up ; the finger small, the hind margin forming a tooth, beyond 

 which the remaining quarter of the joint projects like a nail. 



Fifth Perseopods. — Side-plates broader than deep, narrowly outdrawn behind. The 

 first joint not nearly so long as the third, fourth, and fifth joints together, a little widened 

 for gland-cells at the upper part, the front margin straight, the hinder convex till near 

 the apex ; the second joint longer than broad, the third twice the length of the second, 

 the fourth longer than the third, the fifth longer than the fourth in one of the limbs, not 

 longer in the other ; the finger very small, with bulbous base and strongly curved 

 termination ; the total length of the limb exceeding that of the first joint of the 

 preceding pair. 



Pleopods. — Coupling spines minute ; the cleft spine with unsymmetrical subapical 

 dilatation of the longer arm ; the inner ramus with four joints, the outer with five. 



Uropods. — Peduncles of the first pair reaching the end of the coalesced segment, 

 about as long as the rami ; the rami reaching nearly as far back as those of the third 

 pair, the inner margin and lower part of the outer cut into decurrent teeth ; the peduncles 

 of the second pair reaching nearly as far as those of the first, longer than the outer, 

 shorter than the inner, ramus ; the outer ramus much shorter and narrower than the 

 inner, seemingly with both margins smooth, the inner ramus ornamented like those of 

 the first pair ; the peduncles of the third pair little longer than broad ; the outer ramus 

 rather shorter and much narrower than the inner, smooth ; the inner with teeth on less 

 than half the outer, and more than half the inner, margin. 



Telson extremely transparent, so that its boundaries are difficult to observe, very 

 little longer than broad, the sides at first convex, then flattened, converging to a broadly 

 rounded apex, about a third of the length being beyond the peduncles of the third 

 uropods. 



