844 THE VOYAGE OF H.M.S. CHALLENGER. 



outwards and forwards. Posterior portion of branchial wall of carapace more compressed 

 than anterior portion and projecting over the coxal region of the first somite of the 

 pleon, but underlying that of the second. 



Pleon laterally compressed and dorsally carinated from the anterior margin of the 

 second somite to the posterior margin of the fifth ; carina on second somite obscure, on 

 the third gradually increasing from the anterior margin and produced posteriorly in the 

 form of a large laterally compressed tooth that is nearly as long as the two following- 

 somites ; fourth somite dorsally carinated and terminating in a short tooth ; fifth somite 

 also carinated but less conspicuously, and terminating posteriorly in a minute tooth ; 

 sixth somite not carinated, but furnished with a minute tooth at the posterior extremity 

 in the median line. 



The telson is broken in our only specimen, but from the portion preserved it 

 appears to be dorsally flattened, laterally compressed, long, narrow, and tapering. 



Ophthalmopoda horizontally compressed and furnished with a small tubercle on the 

 inner surface ; ophthalmus larger than the stalk on which it stands. 



First pair of antennae having the first joint deeply excavate, laterally extended, and 

 furnished with a short, obtusely pointed stylocerite ; second and third joints cylindrical, 

 and terminally carrying two flagella. 



Second pair of antennas having two joints to the peduncle beyond the attachment of 

 the scaphocerite, which is broad and foliaceous ; the flagellum is broken off. 



Gnathopoda apparently of generic value only ; the second pair is broken off. 



First two pairs of pereiopoda slender and chelate, the second pair being longer and 

 rather more slender than the first. Three succeeding pairs long and slender ; the basis 

 carrying an ecphysis ; ischium and meros transversely compressed ; propodos very long, 

 cylindrical, and supporting a styliform dactylos that is long in the anterior two pairs 

 and short in the posterior. 



Pleopoda biramose. 



The rhipidura is injured, so that the length of the several parts cannot with certainty 

 be determined. 



Habitat.— Station 147, December 30, 1873; lat. 46° 16' S., long. 48° 27' E.; off 

 Marion Island; depth, 1600 fathoms; bottom, Diatom ooze; bottom temperature, 34°-2. 

 One specimen, female. Trawled. 



