Zoological Society. 367 



extus intusque albidd, nitidd, vald^ i?icequilaterali ; alterd valvuld 

 Icevi, complanatd; alterd convexd et lineis concentricis elevatis, 

 postice striata ; margine ventrali convexo ; dorsali aniico convex^ 

 iusculo et paululhm declivi ; extremitate lateris antici longioris 

 rotundatd ; extremitate posticd obtuse angulatd ; ligamento promi- 

 nente ; fiexurd nulld ; dente laterali antico, minima, approximato. 

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



Hah. ? 



Closely resembling a Psammohia, the minute lateral tooth being 

 scarcely visible. 



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

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

 dis postice ornatd, lineisque minutis concentrice substriatd ; mar- 

 gine ventrali convexiusculo ; dorsali antico subdeclivi, convexo ; 

 extremitate posticd paululiim breviore, vix rotundato-angulatd ; 

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

 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 striulse and by the hinder 

 extremity not being decidedly wedge-shaped. 



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

 laterali, nitidd, albidd (intus candidd), Icevigatd, utrinque rotun- 

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

 latere postico plane brevfore ; natibus inconspicuis ; fiexurd, 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 oblongo-angustd, subtenui, subven- 

 tricosd, intus extusque alba, laevigata, valde incequilaterali, antice 

 rotundatd ; margine ventrali medio subretuso, antice sursum accli- 

 nante ; dorsali antice convexiusculo et vix paululiim declivi, postich 

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

 truncato-acuminato hiante ; ligamento subinfosso ; fiexurd 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. elongatae simillimd, sed magis 

 ventricosd, et extremitate posticd contortd, subrostratd. Long. 

 0-45 ; lat. 0-95 poll. 

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



