17<1 AMPnrPODA NORMALIA. 



furnished with four fasciculi of hairs ; pahn ^\•avcd, very oblique, 

 furnished with a submarginate row of short, and a few long equi- 

 distant hairs, and defined by strong, sharp, moveable spines ; 

 dactylos arcuate, ungiiiculatc, having a small tooth where it 

 suddenly narrows to the unguis. rercio2)oda slender, subequal, 

 furnished with fasciculi of short spines. Antepenultimate pair of 

 pleopoda not reaching beyond the penultimate ; posterior pair very 

 long, the second joint being nearly as long as the first ; inner 

 rami almost rudimcntaiy. Telson as long as the pedvincle of the 

 posterior paii' of pleopoda. 



Male. — Second pair of guathopoda having the propodos less tapering 

 and graceful than in the female, and the posterior pair of pleopoda 

 ■ndth the second joint veiy short. 



Length | an inch. 



Hah. In a pump-well, sunk about fourteen years since, a few feet 

 distant from an old well, at Eing-wood, Hants {Rev. A. R. Hogan). In 

 a pump-well about two hundi-ed years old, at Corsham {Mr. Herbert 

 Mullhis). 



I have followed the authority of Schiodte for the fact that the males 

 in this genus differ from the females in the length of the posterior 

 pair of pleopoda ; but it is singular, in this instance, that the males, 

 if they be males, came from Corsham, and the females from Ringwood, 

 — that is, the long-tailed form was not associated Avith the short- 

 tailed : perhaps the difference may be a variation dependent upon 

 local influence, and not a sexual distinction. 



Through the kindness of the discoverer, the Eev. A. R. Hogan, to 

 whose paper in the ' jS^atui'al Histoiy Review* I would refer the 

 reader for an interesting account of the habits of these remarkable 

 subterranean Crustacea, I have been enabled to keep this species 

 alive for many weeks, and have thus described it more in detail than 

 the others. One fact may be noticed, that the absence of eyes is only 

 after death. 



3. Niphargus Kochianus. (Plate XXXII. fig. 3.) B.M. 



Niphargus Kochianus, Spence Bate. Proc. of Dublin Univ. Zool. and 

 Bot. Assoc. 1859 ; Nat. Hist. Revieic, vi.'p. 165. f. 1. 



Hogan, Proc. Dublin Univ. Zool. and Bot. Assoc. 1859 ; Nat. Hist. 

 JReview, p. 166. 



Thi'ee anterior segments of the pleon produced at the postero-inferior 

 angle to a point, and furnished with three separate hairs upon the 

 anterior half of the inferior margin ; each of the four posterior 

 segments cari-j-ing a solitary haii- upon the posterior dorsal median 

 line. Superior antennae about two-thirds the length of the body 

 of the animal ; flagellum about twice as long as the peduncle. 

 Inferior antennae having the peduncle scarcely longer than the 



