[31] DECAPODA FROM ALBATROSS DREDGINGS. 375 



long as the proximal ; all the segments are more or less setigerous. 

 The exopod is slender, multiarticulate, liagellitbrm, and about as long 

 as the proximal segment of the endopod. The epipod is narrow, lamel- 

 lar, nearly as long as the middle segment of the endopod, and lies be- 

 tween the branchifB of the ninth and tenth somites. 



All the perseopods are furnished with exopods like those of the second 

 gnathopods, and the first, second, and third pairvS are furnished also 

 with epipods like those of the second gnathopods. The first and second 

 are slender, do not reach the tips of the second gnathopods, and are 

 very nearly alike, but the carpus and chela are a little longer and more 

 slender in the second than in the first. In both pairs the merus is a 

 little longer than the ischium, and reaches to the an tero- lateral angle of 

 the carapax. In the first pair the carpus is scarcely more than half as 

 long and about as stout as the merus, and the chela is somewhat longer 

 and a little stouter than the carpus, and with slender, slightly com- 

 pressed and nearly straight digits about a third of the whole length. In 

 the second pair the carpus is scarcely as stout as the merus and about 

 two-thirds as long, and the chela is scarcely stouter than the carpus, 

 but considerably longer. In the second pair there is a slender spine on 

 the lower edge of the distal end of the merus, but otherwise both pairs 

 are unarmed, though sparsely clothed with soft hairs. The third and 

 fourth pairs are nearly alike and reach to about the tips of the second 

 gnathopods : the lower edges of the meri are spinulose, the propodi 

 considerably longer than the carpi, and the dactyli slender, nearly 

 straight, unarmed, and about a fourth as long as the propodi. The 

 l^osterior plteopods are about as long as the third and fourth, and like 

 them except the distal extremities, which are peculiarly modified. The 

 propodus is slender, a little longer than in the tliird and fourth, clothed 

 with a few long plumose setse, thickly beset distally along the lower 

 edge with serrately armed and simple setse, and so densely clothed at 

 the tip with long setse as to very nearly hide the dactylus, which is 

 very short, curved at the tip, and armed with several slender spines. 



The pleou is large relatively to the cephalo-perseon, strongly compressed, 

 and dorsally carinated except upon the first somite, the carina being 

 most conspicuous on the third somite, where it projects posteriorly in a 

 long and very slender tooth. The three succeeding somites each pro- 

 ject similarly in a minute tooth. The pleura of the four anterior somites 

 are broad aud very deep, the height of the pleon at these somites being 

 greater than that of the carapax. The first pleurou is as deep as the 

 second, and its anterior edge is slightly concave in outline; the second 

 is about as broad as high, and approximately orbicular ; the third and 

 fourth project posteriorly in broadly rounded lobes ; the fifth projects 

 posteriorly in an angular lobe obtusely rounded at the tip. The sixth 

 somite is about a third longer than the fifth, and about twice as long as 

 high. 



The telsou is much longer than the sixth somite, very slender toward 



