AMPHIPODA — STEBBING. 579 



divided into uumerous denticles ; accessory plate only on left 

 mandible, similar to the principal cutting edge, but with the 

 denticles microscopic ; spine-row of ten or twelve spines on the 

 surface of the mandibles ; molar small, with normal denticulate 

 crown; palp three-jointed, third joint subequal in length to the 

 second, but much narrower than either second or first. First 

 and second maxilla? apparently agreeing with those of Gilana ; 

 the maxillipeds differing from those of that genus in having 

 the inner plates apically truncate, with two spinules on the 

 inner surface below the apex (as in Cyproidea ornata), the 

 outer plate with its inner border strongly emarginate, the 

 outer carrying a single spine which just reaches the apex, the 

 palp with first joint longer than any of the remaining three. 

 First and second gnathopods in female small, subchelate, with 

 fifth joint more strongly produced in the second than in the first 

 pair. Peraeopods slender, except as to broadly expanded second 

 joint in the last three pairs. 



The generic name is derived from Gitana, a kindred genus, and 

 yeiTcov, a neighbour. The most distinctive features are the 

 upper lip and the mandibles. 



GITANOGEITON SARSI, sp.nov. 



(Plate Ivii. b). 



Station 28. 



Head with small rostrum. Peraeon rather stout, first side- 

 plates small, the three following large, second widening below, 

 fourth very large, emarginate behind for the bilobed fifth. Eyes 

 of moderate size. Upper antennse small, first joint nearly as 

 broad as long, second of equal length but narrower, third small 

 but longer than broad; flagellum five (or? seven) jointed; lower 

 antennte broken, probably not elongate, in peduncle last joint 

 sli'^htly shorter than th« penultimate. Whether the palp of tiie 

 first maxillEe is one-jointed as in Gitana or two-jointed as in 

 Gitanopsis, could not be decided with absolute certainty. The 

 pellucid inner plate carries a single setule on the broad apex, the 

 outer plate has six prominent spines on its oblique apical border, 

 with perhaps one or two more of insignificant size. The outer 

 plate of the second maxillse is very narrow, with three short seta? 

 on the apex. 



The first gnathofods have the fifth joint wider than that of 

 the second pair, but its hind margin less produced ; the sixth 

 joint widens distally to a short oblique palm, which is overlapped 

 by the fiuger, setulo.se on its concave margin. In the second 

 gnathopod the sixth joint widens more gradually and has the 



