REPORT ON THE AMPIIIPODA. 1469 



distallv much widened ; the second is longer than the third ; the third has a long slender 

 spine at the hinder apex ; the fourth or wrist is distallv narrowed, with a spine at the 

 apex of the hind margin, and a concave distal margin projecting behind the hand ; the 

 hand is much narrower than the wrist, with a short, convex hind margin, while the front 

 is prolonged tonguedike in front of the slender curved finger, the acute apex of which 

 projects a little beyond it, and has an adjacent cilium. 



The Perwopods are very like those figured by Claus for the young of Platyscelus 

 ovoides. 



TJie First and Second Perseop>ods have the first joint rather dilated, the second joint 

 about as long as the fourth, the third a little longer than either, with a seta or slender 

 spine at the hinder apex ; the fifth joint is longer than the third, which, like the fourth, 

 has the slender spine of the hind margin above the apex ; the finger is slender, curved, 

 more than half the length of the fifth joint. 



The TJdrd Per&opods have the first joint more dilated than in the following pairs ; 

 the second joint is longer than the fourth, about equal to the fifth, the third is longer 

 than the second, these four having each a subapical spine or seta on the front margin, 

 the fifth also one at the apex behind ; the finger is curved, with a little acute nail ; much 

 more than half as long as the fifth joint. 



Fourth Perseopods shorter than the third or fifth ; the first joint as long as the other 

 joints together, with the hind margin convex, the front nearly straight ; the second joint 

 a little longer than broad, shorter than the fourth joint ; the third joint longer than the 

 fourth ; the fifth joint shorter than the fourth, and abruptly very much narrower, quite 

 unlike the fifth joint in any of the other limbs ; the finger is minute, appearing to form 

 a sharp but very short point in front, behind which there is a fold of the finger scarcely 

 bnger than the front, with a cdium in the bend. The second, third, and fourth joints 

 have each a subapical seta, but much smaller than in the preceding limbs. 



Fifth Perseopods elongate ; the first joint narrower than in the preceding pair, the 

 second joint longer than broad ; the third longer than the second, the fourth than the 

 third, the fifth than the fourth ; the fifth is slightly narrowed at the neck and apex ; the 

 finger is very small, horseshoe-shaped, retractile, capable of lying completely within the 

 narrow truncate apex of the fifth joint. 



Pleopods. — Peduncles not longer than the rami. The two coupling spines well- 

 developed ; each ramus consisting of two joints, the first broad and long, with a plumose seta 

 at each apex, the second short, as broad as its length, with the usual two apical setae ; there 

 is a small cleft spine near the top of the inner margin of the first joint of the inner ramus. 



Uropods. — Peduncles of the first pair as long as the inner ramus ; the outer ramus 

 shorter than the inner, both almost smooth, narrowing to rounded apices ; peduncles of 

 the second pair shorter than the inner ramus ; the outer ramus rather shorter than in the 

 first pair ; peduncles of the third pair as long as the short outer ramus ; the inner ramus 



