[49] DECAPODA FROM ALBATROSS DREDGINGS 393 



plumose seta on the outer edge aud smaller and more numerous oues 

 on the inner; and a small terminal segment about a third as long- as the 

 second, half as broad as long, and edged with small setse or hairs. The 

 exopod is longer even than the endopod, the proximal two-thirds or 

 three-fourths of its length wider than the first segment of the endopod, 

 but the distal portion narrowed, multiarticulate, and flagelliform. The 

 lamelliform branchial epipod is as large as the endopod and the anterior 

 portion a little smaller than the posterior. 



The ischium of the first gnathopod is broader than long : the merus 

 fully as long as the three distal segments taken together, more than 

 three times as long as broad, compressed along the mesial edge, but 

 not expanded distally, and very little wider than the ischium aud pro- 

 podus ; the carpus and propodus are subequal in length and each a lit- 

 tle longer than wide ; the dactylus is a little shorter than the propodus, 

 only half as wide as long, and narrowed to a somewhat triangular tip, 

 which is armed with two or three curved spines ; the edges of all the 

 segments are more or less hairy or setigerous. The exopod is slender, 

 regularly tapered, about a half longer than the endopod, and its distal 

 half multiarticulate, flagelliform, and furnished with long jDlumose setee, 

 while the proximal part is unsegmented and furnished with short hairs 

 or setse. The epipod is short, nearly orbicular, and bears a short and 

 dense dendrobranchia. 



The second gnathopod (Plate X, Fig. 8) reaches considerably by the 

 middle of the antennal scale : the ischium is nearly a third of the entire 

 length of the endopod aud strongly compressed ; the merus is about 

 two-thirds as long as the ischium, compressed proximally, but narrowed 

 slightly toward the distal end, which is approximately cylindrical; the 

 carpus is slender, and about as long as the merus ; the propodus is 

 •slightly smaller and shorter than the carpus, but otherwise like it ; the 

 dactylus is turned in toward the mesial line and carried at right angles 

 to the propodus, is about a third as long as the propodus, very little 

 narrowed, and not tapered, but compressed and truncated at the tip, the 

 edge of which is chitinous, and armed with a few stout spines, and the 

 chitiuous edge continued along the outer edge, which is armed with 

 short spinules and setoe; the inner edges of all the segments except the 

 dactylus are armed with long setse. The exopod is like that of the first 

 gnathopod except that it is a little smaller. The epipod is about as long 

 as in the first gnathopod, but narrow, ovate, and bears a dendrobran- 

 chia nearly as long as itself. 



The first perteopods are slender and reach scarcely by the bases of the 

 antennal scales : the merus is slightly longer than the ischium, and both 

 these segments are strongly compressed vertically and setigerous along 

 the inner edges ; the carpus is slightly compressed, about as wide as 

 the merus, and setigerous like it ; the chela is about as long as the car- 

 ious, aud no stouter, aud the digits are about as long as the basal por- 



