CRUSTACEA. 409 



having the thoracic segments nearly equal, the legs with all 

 the joints hairy, the nails abruptly bent. 



As there is no figure of Nymphon hirtum of Fabricius, it is 

 not possible to ascertain whether the present animal is iden- 

 tical with that or not, but it appears to me that it is distinct, 

 as there is no hairiness about the body of hirtipes. 



Hab. Northumberland Sound, in thirty-three fathoms. 



NYMPHON ROBUSTUM. 

 PLATE XXXV., fig. 4. 



Pedipalparum chelis globosis, digitis valde curvis ; pedibus compressis 

 Ifevibus. 



This very large species is remarkable for the peculiar struc- 

 ture of the pedipalps, which are robust and thick, the terminal 

 portion or hand almost globular, with the fingers much curved, 

 meeting at the points, and thus forming nearly a circle ; the 

 legs are strong and large, somewhat compressed, and quite 

 naked. 



In these descriptions I have considered the segment next 

 to the cylindrical rostrum as the head, of which it is clearly 

 the homologue, as the footjaws and the articulated appendages 

 are attached to the anterior part of this segment. 



Hab. Northumberland Sound, in thirty-three fathoms. 



EXPLANATION OF THE PLATES. 

 PLATE XXXIV. 



Fig. 1. Hippolyte Belcheri. 1 a, natural size; 1 b, supe- 

 rior antennae, the tip of the inner filament removed ; 1 c, ter- 

 minal segment, with the caudal plates on one side. 



Fig. 2. Alauna Goodsiri. 2, natural size, viewed above. 

 2 a, natural size. 2 b, upper antenna. 2 c, one of a pair of 

 delicate knife-like plates, having a thickened line running ob- 

 liquely from base to apex ; the thin outer edge rounded at the 

 tip, folding over on the inner edge ; these rest within the con- 

 cavities of the two portions of the rostrum, and are supposed 



VOL. II. 2 E 



