CB.USTACE.iNS FROM THE TROPICAL ATLANTIC. 359 



the six til ; both these joints being armed with spines, but less densely than in the 

 first pair. The finger is slightly curved, and is much less than half the length of the 

 pieceding joint. 



The first perseopods have the second joint equal in length to the fourth and fifth 

 together, the fourth rather more than half the length of the fifth. The latter, which 

 is as usual specially glandular, is considerably broader and a little longer than the 

 sixth joint. The finger is minute. 



The second perjeopods scarcely difl^er from the first. 



The third perseopods have the second joint equal in length to the first antennse minus 

 the terminal joint. The front margin is produced into a short tooth, in advance of 

 which are two spine-like processes; on the hind margin there are twelve of these 

 processes. The third joint does not equal the breadth of the second ; the fourth is 

 slender, but in length remarkable, falling not far short of the second; the fifth is 

 about two-fifths of the length of the fourth ; the sixth less than half the lent^th of the 

 fifth. The finger minute. 



The fourth perseopods are slender and very long, though shorter than the fifth ; the 

 second and fourth joints being much shorter than in the preceding pair, while the 

 fifth joint is fully as long, and the sixth between two and three times as long as in 

 that pair. 



The fifth perseopods are very slender and short, the total length scarcely equalling 

 that of the second joint in the preceding pair. The minute finger has a bulbous base 

 and a slender hooked termination. 



Branchial vesicles are attached to the first four pairs of peraeopods, and apparently 

 also to the second gnathopods. Some of the vesicles exhibit a rather unusual appear- 

 ance, the centre seeming to be occupied by a series of little globules. 



The pleopods have nine joints to the outer ramus and seven to the inner. 



The uropods all have the peduncle considerably longer than the coalesced inner 

 branch. The first pair are the longest, but do not reach quite so far back as the 

 third ; they have three spines spaced on the inner margin of the rather broad peduncle: 

 the outer branch is represented by a small spine ; the inner is finely serrate on the 

 outer margin. The second pair have a similar outer branch, and the inner branch 

 slightly serrate on the inner margin, and reaching back as far as or a little beyond that 

 of the first pair. The third pair have two spines on the inner margin of the peduncle, 

 the outer margin of the inner ramus serrate with six or seven tiny spinules ; the outer 

 ramus about four-fifths of the length of the inner, microscopically serrate, and carrying 

 minute spinules on its inner margin. 



The length of the specimen, including antennce and uropods, is a quarter of 

 an inch. 



Habitat. Atlantic. Lat. 1° 55' 5" N., long. 5° 55' 5" E. Taken after 9 p.m. from a 

 depth of 360 fathoms. 



3f2 



