404 llEV. T. E. E. STEBBING ON AMPHIPODA FEOM 



joint widens greatly to the palm, with the hind margin sinuous, much shorter than the 

 smoothly curved front ; the palm long, not very oblique, excavate, ending in a wide 

 pocket, which receives the deeply furcate end of the finger, which is thus wdder distally 

 than at its base. 



Second gnatlioiwds. 6 • These scarcely differ from those of Hyale Galatea;, except that 

 the expanded front margin of the second joint is closely fringed with setules, and the 

 sixth is widest near to the base instead of at the junction of the hind margin with the 

 long, very oblique palm. 



Telson,. In situ this is rather markedly upturned, with a slight twist to the blunt 

 apex of each triangularly ending lobe. In other respects this species appears in both 

 sexes to agree with Syale Galatece, except that the size is a little greater. 



Length. S rather over, 2 rather under one-fifth of an inch, 5 mm. 



Hah. St. Croix. The specimens belonging to the Copenhagen Museum were obtained 

 by Oersted in the Danish West Indies. 



The specific name refers to the double-ended finger in the first gnathopods of the 

 male. 



Hyale macrodactylus, n. sp. (Plate 31 D.) 



The side-plates are not deep ; the first is distally widened, the fourth is wide, with 

 deep hind emai'gination. The third pleon-segment has the postero-lateral corners 

 quadrate, the angle scarcely produced. 



Eyes. Not large, rounded, wider apart than their diameter. 



First autenitcv. The pedimcle is short, its first joint suhequal to the second and third 

 combined ; tlie flagellum consists of thirteen joints, of which those near the base are 

 short. 



Second antennce. More than half as long as the body ; the last joint of the peduncle 

 longer than the short j)enultimate ; the flagellum containing twenty-five joints. 



First gnafliojwds. d . The second joint is short and broad except at the base ; the third 

 has a small front lobe ; the fourth an acute hind apex ; the fifth is lobed much as in 

 Hyale dlplodactylus ; the sixth is oblong oval, the palm oblique, spiuulose, sejDarated 

 from the hind margin by a rounded angle carrying a palmar spine, against the inner side 

 of which the apex of the finger closes. 



Second gnatho^wds. j . The second joint is lobed at the distal end of tlie front 

 margin ; the third is lobed in front ; the roixnded apex of tlie fourth touches the base of 

 the sixth ; the fifth is small, triangular, with length and breadth suhequal ; the sixth is 

 elongate, widest at the base, the front margin smoothly convex, the palm closely frmged 

 with slender spinules and extending almost the whole length of the joint, its nearly 

 straight line broken only by a shallow emargination between two slight swellings, one 

 of which is close to the finger-hinge; the long, blunt, slightly sinuous finger can reach 

 the apex of the fourth joint. 



First and second gnathopods. $ . The sixth joint is narrowly oblong. 



Fe^'ceopods. In these the sixth joint at the apex of the inner margin carries a strong 



