REPORT ON THE AMPHIPODA. 995 



some small spines spaced along the slightly convex front margin, and spinules on the 

 convex lower part of the hind margin, the rounded end of which partially overlaps the 

 following joint ; the second joint short, having like the preceding joint a group of small 

 spines on the front apex ; the third joint long and narrow, shorter than the first, longer 

 than the fourth or fifth, fringed with spines along the front border, and having sub- 

 marginal groups of small spines near both borders ; the fourth and fifth joints, which 

 are equal to one another in length, have likewise these submarginal groups, but with 

 stronger spines, and have their front margin fringed with long, slender, beautifully 

 plumose spines, while the fourth has also on this margin five or six groups of long and 

 strong spines ; the finger is short and straight, not one-third the length of the fifth joint, 

 its nail also is very short, curved ; the apical spines of the fifth joint, round the base of 

 the finger, have short accessory threads, and the margin below the thread finely pectinate, 

 many of the other stouter spines being probably furnished in the same manner. 



Fourth Perseopods. — The side-plates much broader than deep, rounded behind, not 

 much deeper in front than behind ; the front and lower margins nearly straight, fringed 

 with spines. The branchial vesicles broader above than below, so attached to the narrow 

 neck as to hang parallel to the first joint of the limb ; near the neck there is a small 

 accessory lobe. The limb resembles that of the third perseopods, but with all the joints 

 longer, except the second ; the first has four or five groups of slender spines at the top 

 and six of shorter and stouter spines below; it is rather wider in most parts than the 

 first joint of the third perseopods ; the third, fourth, and fifth joints are about equal in 

 length, with stout spines on both margins, but none of the long plumose ones seen in 

 the preceding pair ; the finger is larger in proportion to the increased size of the other 

 joints. 



Fifth Perseopods. — Side-plates like the preceding pair, on a smaller scale. Branchial 

 vesicles broadest distally, not so long as the first joint of the limb, with an accessory lobe 

 nearly half the size of the principal, and another much smaller. The limb similar to that 

 of the preceding pair, except that the first joint is more expanded, its upper margin to 

 the rear of the attachment slopes downwards, till at the greatest breadth of the joint 

 it forms an obtuse angle with the hind margin, which takes a straight course to the 

 narrowly rounded apical margin ; the fourth and fifth joints are a little longer than in 

 the preceding pair. 



Pleopods not examined in the adult. In the young taken from the pouch, the 

 coupling spines were very long and thin, with a lateral row of five sharp retroverted 

 teeth, the inner ramus had but three joints, the first very long, with a single cleft spine 

 near the top ; the outer ramus had four joints. 



Uropods. — The peduncles of the first pair longer than the rami, with numerous spines 

 along the margins, and some strong ones at the apex ; the outer ramus rather shorter 

 than the inner, and with fewer marginal spines, each with a group at the apex ; the 



