REPORT ON THE AMPHIPODA. 1415 



figured the fourth joint is a long oval, more than twice as long as broad, thus in the 

 adult making an approach to the shape which the joint has in the young ; the fifth joint 

 as long as the fourth, with pectinate hind margin ; the finger smooth, gently curved, not 

 half the length of the fifth joint. 



Second Peraeopods similar to the first ; the first, third, and fourth joints rather 

 longer, the fourth also a little broader ; the fifth joint scarcely so long as the fourth. 



Third PersBopods. — The first joint about equal in length to the first in the following 

 pair, with spines along the front margin of the somewhat widened lower part ; the 

 second joint short, with minute spinules in front ; the third joint nearly twice as long as 

 the distal width, with spines along the front margin, at the apex of the hind margin, 

 and one as in the other species higher up that margin ; the fourth joint longer than the 

 first, more than twice the length of the third, narrowing a little distally, with spines 

 along both margins, but most along the front ; the fifth joint in the specimen figured 

 as long as the third and fourth together, much narrower than the fourth, a little 

 bulbous at the base, gently curved, with a few spines on the upper half of the convex 

 hind margin, the concave front margin fringed with spines and finely pectinate, not 

 more strongly near the apex than higher up, though with three or four strong teeth at 

 the apex ; the finger short, curved, smooth. The fifth joint in other specimens is 

 straight, longer than the third and fourth joints together, with pectination increasing 

 towards the apex, agreeing in shape with this joint in the other species, yet apparently 

 not attaining the same proportionate length (see fig. prp.S.A). 



Fourth Perwopods differing little from the third; the third joint narrower, but if 

 anything rather longer; the fourth joint about four-fifths of the length of that in the 

 preceding pair, not dilated at the upper part, with spines along each of the serrate 

 margins and on the inner surface ; the fifth joint not a great deal shorter than in the 

 preceding pair, rather broader, with spines on the edges and the inner surface, the front 

 margin finely pectinate ; the finger as in the third peraeopods. 



Fifth Perseopods similar to the fourth, but with the first joint rather longer, the 

 inner of the two hind margins having spines on the lower part ; the fifth joint rather 

 longer than in the fourth pair, with spines on the surface, but the hind margin not 

 serrate or spined and the front not pectinate. 



Pleopods. — The cleft spine as in Euthemisto gaudichaudii both in form and position, 

 and as in that species the first joint of the inner ramus has two plumose setae at the 

 distal end of the inner margin ; in the pleopod examined the joints of the inner ramus 

 were sixteen in number, of the outer seventeen. 



Uropods. — The peduncles of the first pair narrower than those of the second and 

 scarcely so long, rather longer than the long and narrow inner ramus ; the outer ramus 

 also narrow, rather more than half the length of the inner ; in all the pairs the adjacent 

 edges of the two rami are finely pectinate ; peduncles of the second pair as broad as 



