AMPHIPOB GENUS LEPTOCHEIRUS. 571 



row of about 17 verj^ small bristles, like those of the outer side. 

 The finger is exactly the length of the palm ; being closed in the 

 specimen examined, the detail could not be seen, owing to the 

 palmar spines obscuring it. 



This gnathopod in the male differs from that of the female, as 

 in the type species. The 5th joint is longer in proportion ; the 

 2nd and 6th joints shorter. The 5th joint equals the basal joint 

 in length. The 6th is not quite two-thirds its length, and in the 

 natural position is held bent almost to a right angle with the 

 preceding joint. It is expanded distally ; front margin very 

 thick ; hind margin laminar, convex on the upper surface, and 

 furnished with six transverse I'ows of sensory setae ; palmar 

 margin transverse, concave instead of convex, furnished with the 

 submarginal rows of bristles along the margin, and the graduated 

 group at the angle as described for the female ; the very stout 

 strong spine defining the angle is much larger than in the female. 

 On the under side of the hind margin of the 5th joint (not the 

 " basal joint " as given by Holmes (26) p. 522), distally, a chitinous 

 spine-like process is developed ; another similar but smallei' one is 

 on the 6th joint proximally, with a groove beside it, into which 

 the larger one appeal's to fit when the hand is bent in. In order 

 to show these processes, the hand is represented (fig. 10) with the 

 hind margin uppermost, and, in consequence of being placed in 

 this position, the true measurements of this joint cannot be seen ; 

 viewed from the side, it is exactly the same width proximalh' as 

 the 5th, expanding gradually to the palmar margin. The finger 

 in the male is much more arched than in the female, and when 

 closed, the tip, in.stead of meeting the angle as in the female, 

 impinges against the under surface of the hand ; it is finely 

 seri'ate, with a I'ow of setules inset, and appai'ently a small 

 auxiliary tooth near the apex, l)ut this was too obscured liv the 

 overlyiiig palmar bristles to be ascertained with any certainty. 



Second GnatJwpod (fig. 11) as figured l>y Norman. The finger 

 is about half as long as the preceding joint, lightly curved, 

 acute, of the same structure as in the type species ; with 4 setae 

 on the inner margin, and a cluster of 3 subapically in the male ; 

 fewer set?e in the female. 



Perceopod 5. — The finger is of unusual length, considerably 

 longer than those of perfeopods 1 and 2 ; very slender, almost 

 straight, with a setule near the apex. 



Urojjod 3 (fig. 12), 5. — A figure is given of the rudimentary 

 2nd joint of the outer ramus, with the spines omitted. 



Leptocheirus HiRSUTiMANUS Spence Bate. (Plate XVIII. 

 figs. 13-16.) 



The synonymy as given by Stebbing, Das Tierr. p. 627, omitting 

 the references to Heller 1866, and Grube 1866, and adding : — 

 L. pilosus Norman and Scott (36) p. 87. 



The animal described by Heller as Protomedeia hirsuthncma is 



