Zoological Society. 367 



extus intusque albidd, nilidd, valde in<Equilaterali ; alterd valvuld 

 IcEvi, complanatd ; alterd convexd et lineis concentricis elevatis, 

 postive siriatd ; margine ventrali convexo ; dorsali antico convex^ 

 iusculo et pauliilum declivi ; extremitate lateris antici longioris 

 rotundatd ; extremitate posticd obtuse angulatd; ligamento promi- 

 nente ; flexurd nulla ; dente lalerali antico, minimo, approximato. 

 Long. 0-90; lat. 1-50 poll. 



Hub. ? 



Closely resembling a Psammobia, the minute lateral tooth being 

 scarcely visible. 



Tellina Valtonis. Tel. testd ovato-oblongd, fragili, complanatd, 

 subineequilaterali, nitidissimd, pellucidd, rosed, radiis geminis albi- 

 dis post ice ornatd, lineisque minutis concentrice substriu td ; mar- 

 gine ventrali convexiusculo ; dorsali antico subdeclivi, convexo ; 

 extremitate posticd paululhm breviore, vix rotundato-angulatd ; 

 fiexurd, costdque umbonali, obsoletis ; dente laterali antico, parvo, 

 subapproximato. Long. 0"53 ; lat. 0"72 poll. 



Hab. ? Mus. Metcalfe. 



I have named this shell in honour of W. Walton, Esq., whose rich 

 collection has proved of great service to me in my investigation of 

 the very numerous species of this beautiful genus. It differs from 

 exilis by the absence of regular suboblique striulae and by the hinder 

 extremity not being decidedly wedge-shaped. 



Tellina frigida. Tel. testd ovali, solidiusculd, convexd, inecqui- 

 laterali, nitidd, albidd (inttts candidd), Icevigatd, iitrinque rotun- 

 datd ; margine ventrali convexo ; dorsali antico, subdeclivi, convexo ; 

 latere postico plane breviore ; natibus inconspicuis ; flexurd, cos- 

 tdque umbonali, obsoletis ; dentibus primariis minimis, lateralibus 

 nullis. Long. 0-70; lat. 1 poll. 

 Hab. Kamtschatka. Mus. Petit, Hanley. 



I am indebted to M. Petit de la Saussaye for the possession of this 

 rare species. It is closely allied to the edentula of Sowerby, but 

 the beaks are more prominent in that species, and its posterior ter- 

 mination more angular. 



Tellina elongata. Tel. testd oblong o-angustd, subtenui, subvcn- 

 tricosd, iritus extusque albd, Icevigatd, valde incequilaterali, antice 

 rotundatd ; margine ventrali medio subretuso, antice sursum accli- 

 nante ; dorsali antice convexiusculo et vix paululum declivi, j)ostice 

 producto, recto ant subretuso satisque declivi ; latere postico brevi, 

 truncato-acuminato hiante ; ligamento subinfosso ; flexurd sub- 

 obsoletd ; dentibus lateralibus nullis. Long. 1-12 ; lat. 2'20 poll. 

 Hab. Chiquiqui, West Columbia ; in sand at three fathoms. 

 The extremely narrow shape, and the peculiarity of its upper and 

 lower edges being almost parallel, separate it from the majority of 

 its section ; it is however closely allied to the succeeding species. 

 Tellina assimilis. Tel. testd T. elongatse simillimd, sed magis 

 ventricosd, et extremitate posticd coiitortd, subrostratd. Long. 

 0-45 ; lat. 095 poll. 

 Hab. Isle of Luzon ; in sandy mud, six fathoms. 



