REPORT ON THE AMPHIPODA. 651 



little below the hinder. Branchial vesicle expanding greatly from a narrow neck, then 

 with a broad triangle ending in a rounded point ; close to the neck a small, narrow, 

 accessory vesicle ; first joint of the limb not so Inroad as the side-plate and not much 

 longer, broader above than below, with setae on the front margin, serrate on the hinder, 

 with fine hairs on both ; third joint short, expanded below, slightly decurrent behind, 

 setse on the front margin of this and the preceding joint, this with slender spines on the 

 hind margin; fourth joint a little longer than the third, rather broader above than below, 

 where it is twice the breadth of the fifth joint, the spines on both borders slender ; fifth 

 joint slightly longer than the fourth, tlie stoutest of its spines close to tlie hinge of the 

 short, stumpy, curved finger ; all the joints more or less furred. 



Fourth Perieopods. — Side-plates produced downwards in a rounded lobe behind. 

 Branchial vesicle oval, pointed below, shorter than the first joint. First joint a long- 

 squarish oval, with a few scattered spines above and setae below on the front margin, serrate 

 on the hind margin ; third joint as in the preceding pair ; the rest of the limb missing. 



Fifth Perseopods. — Side-plates small ; first joint greatly dilated, narrower above than 

 below, front margin nearly straight, ec^ualling the length of the third, fourth and fifth 

 joints united, the serration on the lower margin behind directed to face the serration of 

 the hinder margin ; the third joint very short, scarcely either dilated or decurrent, with 

 two spines on the lower part of the hinder margin ; fourth joint longer as well as broader 

 than the fifth, of almost even thickness throughout ; fifth joint longer than the third ; 

 finger as in the preceding limbs. 



Pleopods. — The coupling spines on the peduncles very small ; the cleft spines on the 

 inner ramus numbered five in the first and second pairs, four in the third pair, the spoon- 

 shaped branch being nearly as long as the other ; the joints of the rami numbered from 

 eighteen to twenty-two ; on the large first joint of the outer ramus of the first pair there 

 were eighteen plumose setse. 



Uropods. — Peduncles of the first pair not much longer than the outer ramus ; inner 

 ramus with three spines on its upper margin, much shorter than the unspined outer 

 ramus ; second pair short and stout, peduncles longer than the subequal rami, which are 

 slightly curved, sharply tipped, and carry some spines on their edges ; peduncles of the 

 third pair very short, a little longer than the outer ramus, which has a spine on the 

 surface and one on either side of the nail ; the inner branch very short and narrow, with 

 a spine on the middle of its inner margin and one or two cilia near the apex, which 

 descends but little below the spined apex of the peduncle. 



Telson not extending beyond the peduncles of the third uropods, undivided, its 

 breadth and length equal, narrowing but little distally, with eight cilia on the more 

 or less rounded or squared distal border. 



Length of the specimen, in the position figured, from the rostrum to the back of the 

 second pleon-segment, two-fifths of an inch. 



