REPORT ON THE AMPHIPODA. 1261 



The Perieopods resemble those of the female in general, but the serrated palmar 

 spines are placed a little lower down, and the front surface of the hand above these 

 presents a more conspicuous set of spinules ; the dorsal margin of the finger is set round 

 with a series of cilia or setules, which are perhaps only accidentally absent from the 

 female specimen described. 



The following description refers to the female specimen figured on PI. CXLIV. : — 



The lateral lobes of the head scarcely project so far as the frontal process ; the 

 suture is deep between the head and the first segment of the perason, which is about 

 equal in length to the head, and carries almost at the distal end a dorsal tooth, bent 

 very slightly forwards, and, like the other dorsal processes, slightly ciliated ; the 

 second segment is longer than the head and first segment united, longer also than the 

 third segment, dorsally carrying a pair of teeth in front of the centre and a single tooth 

 at the distal end, where there is also a small tubercle on either side ; the third 

 segment has a rather larger pair of lateral tubercles near the base, and two dorsal 

 tubercles, the larger behind the centre, the smaller at the distal end ; the fourth 

 segment is not shorter than the third, and has a couple of dorsal teeth at about the 

 centre and one tooth at the distal end ; the fifth segment is a little shorter than the 

 fourth, and has a tubercle on each side not far from the base, a pair of dorsal teeth at 

 the centre, and another pair not far behind these ; the lateral borders are distally 

 emarginate for the insertion of the perseopods and are acutely produced both at the 

 upper and lower ends of the emargination ; the sixth segment, which like the fifth and 

 seventh is widened distally, is short, subequal in length to the seventh, and, like it, 

 carrying a pair of dorsal tubercles. 



Eyes small, situated on the lateral lobes of the head, with numerous very small 

 ocelli. 



Upper Antenna. — The first joint stout, longer than the head ; the second joint 

 longer than the first, the third thinner than the second, as long as the first ; the 

 flagellum of fourteen joints, of which the first is much the longest, the second the 

 shortest ; all have apical setules and all but the last an apical cylindrical filament. 



Lower Antennse. — First two joints short, the gland-cone not produced along the side 

 of the third joint ; the third joint about twice as long as broad ; the fourth joint as long- 

 as the third joint of the upper antennse, with motor-setae at about a dozen joints, longer 

 as they approach the distal end ; the fifth joint rather thinner and a little longer than the 

 fourth, with similar setae ; the flagellum nearly as long as the fourth joint of the peduncle, 

 the first joint carrying feathered setae and setules like those on the fourth and fifth joints 

 of the peduncle, and apically a pair of spines, which indeed are like the feathered setae 

 except in being shorter and slightly thicker ; the second joint not quite a third as long- 

 as the first, with a similar pair of apical spines amidst numerous apical setules. 



Upper Lip distally bilobed a little unsymmetrically, strongly ciliated. 



