REPORT ON THE AMPIUPODA. 1003 



not greatly expanded, twice as long as broad, the front margin slightly convex, with nine 

 or ten short spines on the lower two-thirds ; of the hinder margins, one straight, the 

 other convex, both smooth ; the second joint very short ; the third not broad, but 

 longer than the first joint, the front margin straight, with five long spines at intervals, 

 and some spinules ; spines also at five points of the scarcely convex hind margin ; the 

 fourth joint rather shorter than the third, the front margin strongly serrate, the hinder 

 slightly, each with spines at four points ; the fifth joint very slender, longer than the 

 third, serrate on both margins, with spines at nine points on each, the points not opposite 

 one another; the finger long and thread-like, if complete in our specimen, measuring 

 about one-third of the fifth joint. 



Fourth Perseopods missing. The side-plates rather smaller than the preceding pair, 

 but simdar, much broader than deep, exceeding in breadth any of the first four pairs of 

 side-plates. 



Fifth Perseopods. — The side-plates apparently broad and shallow. The limb of great 

 length, the first joint between oval and pear-shaped, being much dilated above so that 

 the length does not greatly exceed the greatest breadth, the hind margin smooth, the 

 front with two or three small spines on the lower part, and a larger one on the apex ; the 

 second joint very short, overlapped behind by the first, with a spine or two on the apex 

 in front ; the third joint considerably longer than the first, the hind margin with four 

 strong spines on the convex upper part, the lower part almost straight, smooth, but with 

 two spines at the apex ; the front margin with eight or nine groups of small spines, the 

 apex having also a long one; the fourth joint rather shorter than the third, straight, with 

 serrate margins, the hinder having a single spine, and four strong groups, the front 

 having five strong groups and two small ones ; most of these spines, including even the 

 small ones, appear to be finely pectinate in at least two lines ; the fifth joint is broken, 

 the remaining portion has both edges serrate and armed with spines. 



Pleopods. — The peduncles stout, broader above than below; the coupling spines rather 

 large and broad, the apical part fringed with a row of little retroverted teeth or spines, 

 of which the lowest are the largest, but all are small ; the cleft spines are large, two in 

 number, the longer arm with many little tubercles on the inner side ; the rami are equal, 

 with about twenty joints in each. 



Uropods. — The peduncles of the first pair are subequal in length to the rami, with 

 numerous long spines on the two upper margins and on the apical margin ; the rami 

 equal in length, also with two rows of many marginal spines and some on the narrow but 

 not pointed apices, the margins pectinate and the spines scabrous ; the peduncles of the 

 second pair about equal in length to the outer ramus, having spines on the two inner or 

 upper margins ; the outer ramus much shorter than the inner, the inner even longer than 

 those of the first pair, both strongly spined on two margins and with pectinate edges ; the 

 peduncles of the third pair much shorter than the rami, with a spine at the inner apex ; 



