143 



tremely fine and regular, but become stronger and more decided 

 towards the lower margin, where obsolete radiating lines are likewise 

 perceptible. The smoother valve of Mr. Cuming's superb specimen 

 is rayed with paler streaks, but this is not the case in the few other 

 specimens I have ever beheld of this gorgeous species. The apex is 

 colourless and not rosy as in acuta. 



,j4''Tellina virgo. Tel. testd ovato-oblongd, teniiissimd, planulatd, 

 jj^'"'' nitidissimd, nived, pellucidd, striis obliįuis flexuosis subremotis in 



valvuld uirdgue ornatd ; margine ventrali convexiusculo ; dorsali 

 antico magis minusve declivi, convexo ; latere postico breviore, sub- 

 cuneiformi ; flexurd costdque umbonali obsoletis ; ligatnento satis 

 prominente ; dente laterali antico, parvo, subapproximato . Long. 

 0-55 ; lat. 0-92 poli. 



Hab. ? Mus. Cuming. 



Allied to the Iris of Say, but much larger. The remote obliąue 

 striie entirely cease before arriving at the hinder extremity. It is 

 the most pellucid and glassy-looking bivalve I am acquainted with. 



Tellina imbellis. Tel. testd ellipticd, incBquivalvi, solidiusculd, 

 extus intusque albidd, nitidd, valde incEąuilaterali ; alterd valvuld 

 IcEvi, complanatd; alterd convexd et lineis concentricis elevatis, 

 postice slriatd ; margine ventrali convexo ; dorsali antico convex- 

 iusculo et paululhn declivi; extremitate lateris antici longioris 

 rotundatd ; extremitate posticd obtusi angulatd ; ligamento promi- 

 nente ; flexurd nulld ; dente laterali antico, minimo, approximato. 

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



Hab. ? 



Closely resembiing a Psammobia, the. minute lateral tccth being 

 scarcely visible. 



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

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

 dis postice ornatd, lineisgue minutis concentrice substriatd ; mar- 

 gine ventrali convexiusculo ; dorsali antico subdeclivi, convexo ; 

 extremitate posticd paululilm breviore, vix rotundato-angulatd ; 

 flexurd, costdgue umbonali, obsoletis ; dente laterali antico, parvo, 

 subapproximato. Long. 0*53 ; lat. O" 72 poli. 



Hab. ? Mus. MetcaJfe. 



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

 coUection has proved of great service to rae in my investigation of 

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

 exilis by the absence of regular subobliąue striulse and by the hinder 

 extremity not being decidedly wedge-shaped. 



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

 laterali, nitidd, albidd {intus candidd), Icevigatd, utringue rotun- 

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

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

 tdgue umbonali, obsoletis ; dentibus primariis minimis, lateralibus 

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



Hab. Kamtschatka. Mus. Petit, Hanley. 



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



