(JAMM.Vlilli.i;. 



posterior niargin, and a few short spino-Iikc" hairs on tho anterior 

 or tlcxiblo margin. In other respects the animal appears to re- 

 semble N. pnteanus. 

 length \ an inch. 



Hah. Draw-wells about Zweibriioken (KocJt) ; Grottos of Adels- 

 berg and Lueg in Caraiola {Schludte). In watei- for domestic pur- 

 poses, Leyden, and from a pumj), Maidenhead, England ( iVestwood ). 



Schiodte, in his description of N. aquilex, affirms the dorsal siu-face 

 to possess a carina ; but, after a careful examination of the examples 

 deposited by Mr. Westwood in the British !Musenm, I came to the 

 conclusion that this is an error on the part of the describer, the 

 result probably of examining di'ied and shrivelled specimens. 



I am indebted to Mr. Westwood for a tracing of a figure from the 

 work of Chevalier A'allette St. George above (pioted, and for an exa- 

 mination of the specimen fi-om Leyden, which is preserved in the 

 Hope Collection at Oxford, whereby I have been enabled to identify 

 them with the present species. Koch colom-s his figure of this 

 species of a veiy pale greenish-gi'cy. Mr. AVlrite, in his ' llistoiy of 

 Biitish Crustacea,' describes it as snow-white. 



2. Niphargus fontanus. (Plate XXXII. fig. 2.) V,M. 



Nipliargu.s foutauus, Spciicc Bate, Proc. l)i(bUn Univ. Zoul. and Hot. 

 Assoc. 1859 ; Nat. Hist. Jievieiv, vi. p. 1(55. f. 2. 



Hof/an, Proc. Dublin Univ. Zool. and Bot. Assoc. 1859; Nat. Hist. 

 Review, vi. p. 10(). 



Female. — Cephalon having the ophthalmic lobe anteriorly produced. 

 Pleon having the tkree anterior segments funiishcd at the antero- 

 inferior angle with three separate spines or hairs, and having the 

 postero-infeiior angle produced to a point, which is either apicall y 

 or subapically tipped with a short spLue or hair ; each of the four 

 posterior segments carrying one or two haii's upon the posterior 

 dorsal margin. Eyes minute, imperfectly formed, bright lemon 

 colour. Superior antenna) not half the length of the animal ; 

 flagellum scarcely longer than the peduncle, each articulus distally 

 furnislicd witli a few short hairs and a short auditory ciUiun. 

 Infcrifjr antenna) having the pcdimcle scarcely longer than the 

 peduncle of the superior ; flagellum not longer than the last seg- 

 ment of the peduncle. Maxilliped with small squamous plates, 

 arising from the coxa and bases only. Foui' anterior coxa? fringed 

 along tho inferior margin with four or five equidistant hairs. First 

 pair of gnathopoda like the second, but smaller, and having the 

 palm defined by two spines. Second pair ha^ang the carpus exca- 

 vated infero-antcriorly to receive the posterior portion of the pro- 

 podos ; the propodos subtriangiilar, tho iippor or anterior margin 

 straight, postero-infcrior margin convox. posteriorly prfidurod, and 



