1100 THE VOYAGE OF H.M.S. CHALLENGER. 



minutely pectinate, fringed with small spines ; the finger is curved, with the usual dorsal 

 cilium ; the nail closes down against a palmar spine, set on the surface at some distance 

 from the hind margin. There are scattered groups of spines on the surface besides those 

 already mentioned. 



First Perseopods. — The side-plates very similar to the preceding pair. The first joint 

 of the limb reaching much beyond the side-plates, well packed with gland-cells, the hind 

 margin fringed with long spines, the front with short ones ; the second joint with an 

 apical group of spines ; the third joint much longer than the fourth, with spines at three 

 points behind and the apex in front ; the fourth joint like the third widening distally, 

 the hind margin fringed with numerous slender spines, the apex in front carrying a small 

 group ; the fifth joint longer than the fourth, shorter than the third, narrowing distally, 

 with some six groups of slender spines on the straight hind margin, a group at the apex 

 of the front convex margin, and another high up on it ; the finger more than half the 

 length of the fifth joint, with an opening at the tip, and near the base a long dorsal 

 feathered cilium. 



Second Perseopods not specially examined ; similar to the preceding pair. 



Third Pera3op>ods. — The side-plates broad, the front lobe large, nearly as deep as in 

 the preceding pair, the hind lobe small. The first joint of the limb scarcely longer than 

 broad, dilated above, narrowing distally, with spines, but not stout ones, at intervals on 

 the slightly convex front margin and the upper margin adjoining ; the hind margin very 

 convex above, carrying a few spinules, and near the apex a stout spine ; the second joint 

 with an apical group of slender spines ; the third joint broader than the fourth, but about 

 as long, with spines at the apices ; the fourth joint bordered with some short stout 

 spines ; the fifth joint much longer than the fourth, with stout spines at three points in 

 front, slender ones at two points behind ; the finger short and strong, very much curved, 

 with a dorsal feathered cilium near the hinge, and a smaller cilium near the base of the 

 sharp nail. 



Fourth Perseopods. — Side-plates very shallow. The limb missing. 



Fifth Perseopods. — Side-plates small and shallow. The limb a good deal longer than 

 that of the third perseopods. The first joint broader above than below, but not greatly 

 dilated at any point, much longer than broad, with spinules on the slightly convex front 

 margin, and setules on the almost straight hind margin, which has a stout spine near the 

 apex ; the second joint longer than broad, with an apical slender spine ; the third joint 

 longer than the fourth, with stout spines at three points of the hind margin, one at the 

 apex in front, with other slenderer spines on that margin ; the fourth joint with spines at 

 two points on the hind margin, and two or three in front ; the fifth joint longer than 

 either of the preceding, with four groups of spines in front, and three of slenderer spines 

 behind ; the finger not nearly half the length of the fifth joint, longer and less strongly 

 curved than in the third perseopods, but similarly armed. 



