KEW BRITISH AMPHIPODA. 39 



slightly feathered spines at five points of the lower margin; the third joint shorter 

 than the second, with spines at five or six points ; the flagellum of three joints, 

 together not so long as the first two of the peduncle ; the secondary flagellum consisting 

 of a single joint less than a half or sometimes a third of the first joint of the principal 

 flagellum. 



Lower antennce. Gland-cone small, the third joint with a lobe at the distal margin on 

 either side, the fourth joint not longer than the fifth, distally widened, the fifth joint 

 rather longer than the three-jointed flagellum. In general appearance the lower 

 antennae from the third joint onwards greatly resemble the upper, but they are stouter 

 and a little longer. 



Mandibles. The cutting-edge has four teeth ; the secondary plate on the left mandible 

 has also four teeth, but on the right an irregularly serrate edge ; the spine-row consists 

 of three serrate spines; the molar tubercle is strong, with a little denticulate plate in a 

 recess of the forward margin; the first joint of the palp is short, distally widened, the 

 second joint is broad, with nine plumose spines on the convex margin ; the third joint 

 is also broad, but shorter than the second, with a transverse row of four spines on the 

 surface, and about fourteen on the apex and adjoining border. 



Lower lip. The outer lobes rather broad, lightly furred. 



First and second maxillm, so far as observed, differing little from those of Podocerus 

 falcatus (Montagu). 



MaxiUipeds. The inner plates having two spine-teeth on the apical margin and one 

 on the inner, and four curved spines about the apical margin ; the outer plates reaching 

 beyond the middle of the second joint of the palp, carrying three spine-teeth on the 

 inner and four on the distal margin ; the third joint of the palp a little more than half 

 the length of the second ; the fourth joint short and blunt, tipped with spines longer 

 than itself. 



Fir-st gnathopods. The side-plates very small, almost concealed under the following 

 pair, the lower margin a little indented. The limb small, the first joint curved, having 

 a long seta or slender spine below the middle of the convex hind margin ; the wrist 

 triangular, scarcely longer than the oblong third joint, each having some spines about 

 the distal margin and a few on the inner surface ; the hand oval, about twice as long 

 as the wrist, with several slender spines along the hind margin and about the inner 

 surface ; the palm ill-defined, except by the set of three palmar spines, among which 

 the tip of the curved finger closes, reaching a little beyond them. 



Second gnathopods. The side-plates very much longer than the first pair, with convex 

 front margin directed forwards. The branchial vesicles remarkably small. In the 

 male the first joint channelled, shorter than the hand; the second joint channelled, 

 distally widened ; the third joint scarcely longer than the second, with a couple of 

 setules at the apex ; the wrist absorbed into the hand, which is very large, when full- 

 grown two and a half times as long as broad, the front margin convex, the hind margin 



