512 On a new Ampin pod Species. 



row of 13 minute ones along the inner margin ; 6 small 

 spines are inset subraarginallv on the outer surface. Palp 

 short, hardly longer than the outer plate ; terminal joint 

 with a distinct nail and 3 setules subapically ; the second 

 and third joiiits setose on the inner margins. 



Gnathopod 1 much as in longipes ; secord joint slightly 

 longer in proportion ; sixth joint, palm oblique, with two 

 sensory spines at tiie angle ; palmar margin convex and 

 serrulate; finger a little longer tiian the palm, furnished with 

 a decurrent tooth near the apex, 3 setules inset in the notch 

 and 1 behind it. 



Gnathopod 2 (figs, 7 and 8) much more slender than in 

 longipes. The second joint is longer in proportion. The 

 sixth joint differs from that of the type species. In Jongipes 

 it is described by Sars as being a little shorter than the titth, 

 oblong-oval, with the *' superior edge straight, inferior one 

 bulging out at the middle " ; the distal end is truncate, the 

 finger being inset in the middle of the margin ; the palm 

 .straight, rounding into the hind margin. In alleni the sixth 

 joint is considerably shorter than the fifth ; it is long and 

 narrow, inferior margin straight, not bulging, front margin 

 straight, curving a little distally to tlie insertion of the finger. 

 'J'he palm is convex and produced at the palmar angle ; the 

 finger smaller than in longipes, of the same construction, but 

 with the base more swollen ; tip curved, acute, with a 

 decurrent tooth and a cluster of stiff bristles subapically. 

 The bristles on the outer side of the hand are more striking 

 than in longipes ; the bases are more swollen, being twice the 

 width of the shafts, and the apical flngella are much loi5ger 

 and thinner (see fig. 8). 



Perceopods much as in longipes; first and second alike, 

 slender, densely setose on the hind margins of the fourtli, 

 fifth, and sixth joints ; finger long, nearly three-quarters the 

 length of the sixth joint. The hinder perieopods rapidly 

 increase in length ; basal joints closely set with small spines 

 anteriorly, posterior margin serrated ; the other joints veiy 

 slender, spinose, fingers equalling those of the anterior peraio- 

 pods in length, but only half their width. 



Pleopods. — Rami long, with about 17 joints in the inner, 

 and 19 in the outer ramus ; 5 cleft spines ; coupling spines 

 small, the lower one with 3 recurved teeth, the upper and 

 smaller one with 4. 



Uropods more slender and more spinose than in the type 

 species. Uropod 1 : peduncle very long and slender, with a 

 row ot 20 short spines on the outer curve, 8 longer ones on 

 jiie inner side; lanii only two-tliirds as long as the peduncle, 



H 



