REPORT ON THE AMPHIPODA. 923 



supial plates smaller than in the preceding pair ; the limb in all material points resembling 

 the first perseopods. 



Third Perseopods. — Side-plates not very deep, hind lobe a little deeper than the 

 front. Branchial vesicles smaller than in the preceding pair. Marsupial plates narrow, 

 not very long. First joint of the limb broadly oval, broader above than below ; the 

 front margin with spines, the hinder, which is the more convex, serrate, the lower lobe 

 scarcely at all overlapping the short second joint ; the third joint rather shorter than 

 in the two preceding pairs, with spines at four points on each margin, the hinder a little 

 decurrent, ending obtusely ; the rest of the limb missing. 



Fourth Perxopods. — Side-plates with a lobe behind, very decurrent. First 

 joint similar to that of the preceding pair but larger ; third joint also longer, with 

 six groups of spines on the front, four on the hind margin. The rest of the limb 

 missing. 



Fifth Perseopods. — Side-plates small, not decurrent. Branchial vesicles not nearly 

 as long as the first joint, narrow, with parallel sides, a short piece at the base being 

 much narrower than the rest. The first joint larger than in the preceding pair ; the 

 third joint rather straighter than in the preceding pair, with spines at five points on 

 each margin, the spines stronger. The rest of the limb missing. 



Pleopods. — There are long and short spines on the side and apex of the peduncles ; 

 the coupling spines are small, so far as observed, with one strong lateral retroverted tooth 

 in addition to the apical, and a row of denticles along one edge ; the cleft spines appear 

 to be four in number ; the joints of the rami fourteen to sixteen. 



Uropods. — Peduncles of the first pair a little longer than the inner ramus ; the rami 

 slender, with spines on the edges and the blunt tips, the outer ramus shorter than the 

 inner ; peduncles of the second pair longer than the outer, shorter than the inner ramus, 

 reaching back to about the same point as the preceding peduncles ; the rami rather 

 broader, respectively shorter than those of the first pair ; peduncles of the third pair 

 shorter than the rami ; the rami broadly lanceolate, subequal, with spines on both 

 margins, and little teeth on the inner margin near the base of the spines ; the inner 

 and upper ramus has its inner margin pectinate ; both have a nad-like termination, 

 with a cilium near the tip. 



Telson longer than the peduncles of the third uropods, broadest at the base, longer 

 than its greatest breadth ; cleft for nearly three-quarters of its length, not dehiscent, 

 lateral margins convex or a little sinuous, the distal end emarginate, the end of each lamina 

 being cut into five teeth, with small cdia in the interstices. 



Length. — The specimen, in the position figured, measured, from the front of the 

 head to the back of the third pleon-segment, a quarter of an inch. 



Locality. — Station 1G1, off Melbourne; depth, 33 fathoms; bottom, sand. Two 

 specimens. 



