I>LATT6CKHn.l!. 335 



Bcmbling the second, but ioiii^or and roverscd : fourtli pair ha\'in{? 

 the basos not diluted ; the carpus increasing towards the distal ex- 

 tremity ; propodos broader and longer than the carpus, and having 

 the antero-distal angle developed into a process longitudinal with, 

 and equal in length to, the propodos, against the extremity of which 

 the dactylos impinges and forms a perfectly chelate organ ; dactylos 

 longer than the process of the propodos, arcuate : fifth pair not 

 half the length of the preceding, and having the dactylos repre- 

 sented by a spine. Three posterior pairs of pleopoda having the 

 rami styliform. Telson narrower than the preceding segment. 

 Length less than ^\jth of an inch. 



5. THAMYRIS, n. g. 

 Superior antennao short, three-jointed. Inferior antenna obsolete. 

 Posterior pair of pereiopoda represented by a basos in the form of 

 a membranous scale only. 



In aU other respects this genus so nearly corresponds with 

 Brachi/scehis, that future research wiU probably demonstrate their 

 closer connexion. 



1. Thamyris antipodes, n. s. (Plate LIII. fig. 4.) B.M. 



Superior antennae ha\ing the second joint curved, and inflected against 

 the first ; third not longer than the second, tapering to an obtuse 

 point, the whole lying hid against the under surface of the cephalon. 

 First pair of gnathopoda having the ischium and meros serrated on 

 the inferior margin ; cai-pus infero-anteriorly produced, longer than 

 the propodos, serrated on the anterior and inferior margins ; pro- 

 podos serrated on the inferior margin : second pair resembling the 

 first, but longer. First two pairs of pereiopoda simple ; third pair 

 ha^^ng the basos ovate, the remaining joints longer than the basos ; 

 fourth pair having the basos narrowest near the distal extremity, 

 the remaining joints not so lo^.g as the basos, and serrated upon 

 the flexible margin ; fifth pair membranous. 



Length -^-ths of an inch. 



Ilah. Near the antipodes, in lat. 58° S., long. 172° W. {Mr.Rayner, 

 Surgeon II. M.S. Herald), 



6. AMPHIPRONOE, n. g. 



Cephalon roiuid, anteriorly oblique. Pereion not broader than the 

 cephalon. Picon having the fourth and fifth segments fused into 

 one. Superior antennae having the peduncle tliree-jointed ; third 

 joint large, interiorly convex and anteriorly produced, having the 



