366 Zoological Society. 



laterali ; margine ventraU convexiusculo, antice sursum acclinante ; 

 dorsali, antice magis minusve convexo et declivi, postice recto brevi, 

 et subito declivi; extremitate lateris antici longioris attenuato- 

 rotundatd ; extremitate posticd brevissimd, truncato-cuneiformi ; 

 fiexurd costdque vmbonaU. ohsoletis ; ligamento infosso ; dentibus 

 primuriis parvis, Interalibus nullis. Long. 1'45 ; lat. 1'90 poll. 



Hab. Real Llejos, Central America ; in sandy mud, seven fathoms. 



Closely allied to the truncata of Jonas, but that species is much 

 thicker and its shorter extremity simply wedge-shaped. 



Tellina FORMOSA. Tel. testa obovatd, convexiusculd, vcdde ince- 

 quilaterali, albidd, radiis interruptis roseis, striisque mimitis con- 

 fertis obliquis, undique ornatd ; margine ventrali convexo ; dorsali 

 utrinque convexiusculo, antice subdeclivi, postice valde declivi; 

 extremitate lateris antici producti rotmidatd, postici brevissimi 

 obtusissime angulatd ; flexurd subobsoletd ; dentibus lateralibus 

 nullis. Long. 0"43 ; lat. 0'55 poll. 



Hab. Daleguete, Zebu ; sandy mud at ten fathoms. 



The absence of lateral teeth, the general shape, the brilliant colour- 

 ing and minute oblique striae, unite in rendering this unique shell 

 easily distinguishable from any species of this genus. 



Tellina Sol. Tel. testa oblongo-ellipticd, solidiusculd, compressd, 

 nitidd, rubro-avrantid, alterd in valvuld concentrice substriatd, 

 alterd subUevigald. ; margine ventrali convexo, postice sursum ac- 

 clinante ; dorsali utrinque subdeclivi, convexiusculo ; latere antico 

 longiore, ad extremitatem rotundato ; extremitate posticd in juni- 

 oribus subacuminatd, in adultis obtuse angulatd ; natibus planulatis ; 

 ligamento infosso ; dente laterali unico, antico, distincto. Long. 

 2-40 ; lat. 4-25 poll. 



Hab. ? Mus. Cuming, Metcalfe. 



This truly magnificent shell unites the aspect of the acuta of Wood 

 to the brilliant hues of T.foliacea. The concentric striae are ex- 

 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. 



Tellina virgo. Tel. testa ovato-oblongd, tenuissimd, planulatd, 

 nitidissimd, nived, pellucidd, striis obliquis flexuosis subremotis in 

 valvuld vt7'dque ornatd ; margine ventrali convexiusculo ; dorsali 

 antico magis minusve declivi, convexo ; latere j^ostico breviore, sub- 

 cuneiformi ; flexurd costdque umbonali obsoletis ; ligamento satis 

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

 0-55 ; lat. 0-92 poll. 



Hab. ? Mus. Cuming. 



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

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

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

 Tellina imbellis. Tel. testa ellipticd, inccquivalvi, solidiusculd, 



