REPORT ON THE AMPHIPODA. 931 



and longer than in the gnathopods ; the second joint short ; the third scarcely decurrcnt 

 in front, a little longer than the fourth, shorter than the fifth joint, weakly armed, the 

 longest spine being on the front apex ; the fourth joint with spines at three points of the 

 straight hind margin, setules at two points of the convex front ; the fifth joint almost 

 straight and of even breadth, with spines at four points of the hind margin, and three 

 groups of setas in front ; the finger almost straight on the inner margin as far as the 

 cilium at the base of the much-curved nail ; a small dorsal cilium near the base of the 

 finger is followed by two others at intervals on the dorsal margin, which has a minutely 

 pectinate appearance. 



Second Perseopods. — -Sule-plates a little longer and broader than the preceding, the 

 attachment narrow, the excavation behind being broad and shallow, the hind margin below 

 the excavation sloping gently forwards. The limb missing below the third joint ; the 

 upper part closely resembling that of the first perseopods. 



Tltird Perseopods.— Side-plates broader than the preceding, the hind lobe a little 

 deeper than the front. First joint broadly oval, rather wider above than below, with 

 spinules at two points and spines at two points of the front mai'gin, and six spinules in 

 the serrations of the hind margin ; there is also a spine on the inner surface at the hinder 

 apex within the wing ; the short second joint with a spine at the front apex ; the third 

 joint with spines at three points on each margin, those on the squared slightly decurrent 

 hinder apex forming a tolerably strong group ; the fourth joint a fittle expanded dis- 

 tally, shorter than the third joint, carrying spines at three points in front and on the 

 hinder apex ; the fifth joint with spines at four points in front, and two behind ; the 

 finger as in the preceding perseopods. 



Fourth Perseopods. — Side-plates with a somewhat decurrent hind lobe. The branchial 

 vesicles reaching a little below the hind lobe of the side-plate, and having apparently a 

 small narrow accessory sac near the base. The first three joints of the limb resemble 

 those of the. third perseopods, but the first and third are larger ; the rest of the limb 

 missing. 



Fifth Perseopods. — Side-plates small, almost semicircular, but the front margin bent 

 and flattened. Branchial vesicles minute, oval, pointing backwards. The first joint 

 longer and much broader than in the preceding pair, much broader above than below ; 

 the third joint similar to that in the preceding pair, but rather larger ; the rest of the 

 limb missing. 



Pleopods. — Coupling spines very small, seemingly with only one lateral tooth on 

 each side below the apex ; of cleft spines I could only discover two even in the first 

 pair, a short one with another much longer below it, having the arms long, nearly equal ; 

 the inner ramus with seven joints, the outer with nine, the first joint in each as long as 

 three or four together of those that follow. 



Uropods. — Peduncles of the first pair shorter than the inner, longer than the outer, 



