307 



great ligament retuse but afterwards convex ; beaks eroded ; Hexure 

 obsolete ; inside pink with a darker ray or stain on either side ; 

 primary teeth two in each valve, a simple and a bicuspidate, which 

 are alternately inserted. 

 Icy Cape. 



165. Tellina Columbiexsis (pi. Ixv. f. 2iG.) Ilanla/, Zool. 

 Proc 1844. 'J' 



T. testa elliptica aut oblongo-elli])tica, compressiuscula, sub- 

 ten ui,J[aivigal a, extus intusque albida, epidermide tenuissima fulvo- 

 cinerea induta; margine ventrali medio convexiusculo, utrinque 

 arcuato; dorsali utrinque convexo, antice paulo, postice satis de- 

 chvi ; ^latere antico longiore, rotundato ; extremitate postica acu- 

 minata ; flexura costaque umbouali subobsoletis ; ligamento pro- 

 minulo ; dentibus minimis. 



EUiptic or elongated-elliptic, fragile, subinequivalve, ratlier 

 compressed, wliitish, covered by a very thin opalescent pale drab 

 epidermis, quite smooth ; ventral edge arcuated, ascending poste- 

 riorly ; anterior side much the longer, its extremity rounded and 

 somewhat attenuated, its dorsal edge convex and scarcely sloping ; 

 posterior end acuminated, hinder dorsal edge at first hollowed out 

 for the slightly prominent ligament, tlien very convex and consi- 

 derably sloping; flexure and umbonal ridge all but obsolete; in- 

 side white, teeth minute. 



Monte Christi, West Columbia. 



Its more compressed valves and minute teeth will distinguish it 

 from the few species which are allied to it in outline. The liino-e- 

 margin is very short and rather broad. 



167. Tellina RiTFESCENs (pl.lxiii. f. 213.) Chemnitz, vol.vi. 

 f. 97. (male); Dillw. D. Cat. p. 85; T. operculata, Gmel. 3235; 

 Wood, Gen. Conch, p. 165. t. 42. f. 1 ; Lam. no. 13; Sow. Gen 

 Shells ; Hani. Des. Cat. p. 62. t. 4. f. 37 ; Knorr. vol.vi. 1. 12. f.l. 



T. testa ^oblonga, inaequivalvi, insequilaterali, sohda, subnitida, 

 rubro-rosea (intus saturatius fucata), sublajvigata, lineis obsoletis 

 radiantibus plerumque notata ; altera valvula convexa, altera com- 

 planata; margine ventraH medio subrecto, utrinque (praesertim 

 postice) sursum accHnato ; dorsali antico convexo, et vix declivi ; 

 dorsali postico subdecKvi, prope hgamentum magnum prominensque 

 retuso, delude magis minusve convexo; latere antico paululum 

 breviore, rotundato; postico attenuato obtusissime acmninato; 

 costa umbonali lata, obtusa ; flexura subobsoleta. 



Oblong, inequivalve, rather strong, scarcely glossy, within and 



