THE COPENHAGEN MUSEUM AND OTHER SOURCES. 41 



corner rounded, the hinder acutely produced. The whole limb is very slender, and, like 

 all the other perseopods, is adorned with long plumose setse. The second joint is 

 elongate, with four or five setoe on the hinder margin and two on the front. The fourth 

 joint has four setfe on the front margin; the fiftli has one on the front and two on the 

 hind margin ; the sixth, which is rather longer than either of the two preceding, has two 

 setae of great length on the hind margin and two or three on the front. The seventh 

 joint is not finger-like, less than half the length of the sixth, its apical margin not acute, 

 fringed with six ])lumose sette, mostly of great length. 



Second perccopods. The side-plates are almost oblong, twice as long as deep, with the 

 upper margin slightly excavate. The limbs are in near agreement with the preceding 

 pair. 



Third per(E02)ods. The side-plates are bilobed, the hinder lobe the deeper. The second 

 joint is ex23anded, rather deeply notched on the hind margin. The third joint is short. 

 The remaining joints are all very elongate, armed with numei'ous spines and long 

 plumose seta; on both margins, except in the case of the finger, which has the settc only 

 on the hind margin. The fourth, fiftli, and sixth joints are severally much longer 

 than the second, which is scarcely, if at all, longer than the straight acute finger. 



Fourth percBopods. The hind lobe of the side-j)lates is rather long, the front one 

 evanescent. The limb is like that of the preceding pair, but with a larger second joint, 

 and the fifth decidedly shorter than the sixth. 



Fifth percropods. The side-plates are not bilobed. ils already noticed, there are 

 branchial vesicles. Tlie second joint is rather longer than in the preceding pair, while 

 the fifth and sixth are not quite so long. As in the two preceding pairs, the setae fringing 

 the margins of the sixth joint are of great length, and the hinder apex carries a remark- 

 able tuft of these elongate appendages, which, together with those on the fingers, produce 

 a striking eff"ect. 



Fleopods. There are three or four cleft spines on the first joint of the inner ramus, 

 this ramus consisting of seventeen joints, while the outer, which is slightly longer, has 

 nineteen. 



TJrop>ods. In the first pair the peduncle is nearly as long as the inner ramus, and 

 carries some small plumose setaB on its outer, and spines on its inner margin. The outer 

 ramus is a little more than half the length of the inner. Both have many spines alouo- 

 the margins, those on the inner margin of the inner ramus being small but very close- 

 set. The peduncle of the second pair is about as long as the outer ramus, which is less 

 than half the length of the inner. These rami are armed as in the preceding j)air, which 

 they a little exceed in length. In the third pair the pedimcles rather exceed in length 

 those of the preceding pair. The outer ramus is a little shorter than the inner of tlie 

 second pair; it has spines at six points of the outer margin, and the inner fringed witli 

 spines and many long plumose setae. The inner ramus is rather longer than that of the 

 second pair, and is fringed on both margins with spines and long plumose setae. 



Telsoii longer than the peduncles of the third m-opods, distally cleft for about a 

 quarter of its length ; a little way above the acute apices a notch on either outer margin 

 carries a long seta, and there is another a little higher up than the top of the cleft. 



SECOND SERIES. — ZOOLOGY, VOL. VII. 6 



