REPORT ON THE CRUSTACEA MACRURA. 287 



The first pair of pereiopoda is a little more robust than the second, and is fringed on 

 the anterior margin with long hairs, while the two next pairs have none. 



The posterior two pairs of pereiopoda are long and slender, especially the last, which 

 is as long as the entire animal, and when extended forward reaches considerably beyond 

 the peduncle of the first j:>air of antennas. 



The pleopoda are short, and, as in Penaeus, biramose. except the first pair, and they 

 gradually decrease in length posteriorly. 



Length (female), 76 mm. (3 in.). 



Habitat— Station 170, July 14, 1874; lat 29° 55' S., long. 178° 14' W. ; off the 

 Kermadec Islands; depth, 520 fathoms; bottom, volcanic mud; bottom tempera- 

 ture, 43°. Numerous female specimens. Trawled. 



This species is generally large and robust. The teeth on the hepatic and frontal regions 

 are longer and more spine-like, and the outer antennal tooth is post-marginal. 



The first pair of antennae has the peduncle rather longer than the rostrum, and the 

 nagella about once and a half as long as the carapace ; the first joint carries a short 

 prosartema, and a strong, thick stylocerite that is nearly as long as the opkthalmopod. 



The second pair of antennas has the flagellum very long, being more than twice the 

 length of the animal. 



The pereiopoda are long, and each carries a small and almost rudimentary ecphysis 

 attached to the second or basisal joint ; the last two pairs are much longer, owing appa- 

 rently to the extreme length of the ischium and meros. There are no teeth on the basis 

 or meros of the first and second pairs of pereiopoda. The genital tubercles on the 

 third pair meet in the ventral median line, and behind them, between the fourth pair, 

 is a transverse tubercle, and between the fifth pair is a less prominent triangular 

 tubercle. 



Between the first pair of pleopoda is a small tooth, and between the second a 

 transverse ridge. The inner branch on the first pair in our specimens, which are all 

 females, is very rudimentary, and the other pairs are not remarkable for their 

 length. 



The posterior pair of pleopoda, which helps to form the rhipidura, has the outer 

 plates scarcely longer than the inner, and the outer margin is strengthened by a ridge 

 terminating in a subapical tooth, and marked by an imperfect diaeresis. 



The telson is long, tapering, dorsally depressed in the centre, armed on each side 

 with a long, sharp, spine-like tooth, and terminates in a sharp and styliform point. 



Tin' ventral aspect of this species, of which we only know the female, differs from that 

 of other species in having a large, prominent and pointed tubercle in the median line, 

 posterior to the enlarged coxae of the third pair of pereiopoda (fig. 2" ? ). The posterior 

 somites are not remarkable, and the first pair of pleopoda is only of generic importance. 



