REPOET ON THE AMPHIPODA. 613 



Upper Antenrue. — First joint stout, cylindrical, longer than the combined length of 

 the two following joints, which are very short, and the long first joint of the flagellum. 

 Flagellum tapering, in the female consisting of twenty joints, of which the first is longer 

 than the four following united ; besides the usual brush it has two large, slightl)^ curved, 

 distal spines ; the second joint has two similar spines, and the fourth joint a similar but 

 much smaller spine ; the secondary flagellum is of nine joints, the first very long, the 

 last minute. In the male the primary flagellum has calceoli on most of the joints. 



Lower Antennse. — First joint broad ; the gland-cone with a conspicuous orifice, not 

 spiniform ; third joint with lower and distal margins lobed, fourth and fifth joints furred 

 above, and with various groups of setae below, one group in the fourth joint being on a 

 little prominence near the base ; the fifth joint somewhat longer than the fourth ; 

 flagellum in the female of about thirty joints, of which the first is much longer than the 

 second. In the male the flagellum has about fifty joints, and is furnished with calceoli. 



Mandibles with the palp far forward, just over the narrow interval between the 

 molar tubercle and the spine-row ; cutting edge smoothly convex, but with a small 

 projection at the top, and an emargination in the return of the curve below. The 

 secondary plate in the left mandible is short and narrowly ligulate. The spine-row 

 consists of three curved spines. The molar tubercle is large and prominent, the crown 

 of it minutely dentate and ciliate, pointing away from the cutting edge, the articular 

 condyle pointing towards that edge. The first joint of the palp very short, the second 

 very long, with a row of pectinate spines on the distal part of its margin. The third 

 joint, about half the length of the first and second united, has two long spines near the 

 outer angle of its base, and along almost the whole of its inner margin a row of pectinate 

 spines, of which those at a little distance from the apex are the shortest, those at and 

 close to the apex the longest. 



Lower Lip deeply cleft, much ciliated round the margins of the forward lobes, which 

 are rather abruptly contracted near their extremities, thus making the inner margins very 

 sinuous ; the ovate mandibular processes almost smooth. 



First Maxillse. — Inner plate small, oval, ciliated along the inner edge, and with two 

 unequal plumose bristles at the apex ; outer plate much ciliated on the surface and distal 

 part of inner margin ; at its apex five long spines, this row continued inwards on the 

 outer side by two more, while a row of four, rather smallei-, descend the sinuous inner 

 margin ; all are dentate on their edges some way short of the curved tip, the end one on 

 the outer side having but one tooth, the end one on the inner side having several 

 denticles. The two-jointed palp overtops the spines of the inner plate. The second 

 joint is very much expanded distally, the curve of the outer margin ending in two 

 microscopic teeth at the point of greatest expansion, the margin then running obliquely 

 to meet the great distal curve set with nine teeth and a spine, the spine being outermost, 

 with a short, spiny seta not far ofi". 



