270 



shaped, its dorsal edge straight (or subretuse) and much sloping; 

 beaks prominent, acute ; ligament sunken ; unibonal ridge very 

 distinct; inside white; lateral teeth distinct, the hinder slightly 

 the more distant. 

 Ceylon. 



88. Tellina plicata (pi. kii. f. 191.) Valenciennes, Enc. 

 Meth. t, 287. f. 3. 



T. testa, obovali, tenuiuscula, subventricosa, tortuosa, aequilate- 

 rali, impolita, intus extusque Candida, striis elevatis lamellosis con- 

 centrice ornata; margine ventraH arcuato, postice sursum accli- 

 nato; dorsah utrinque panlulum declivi, antice convexo (sed 

 juxta lunulam brevem distinctam incurvato), postice convexiusculo 

 et elevatiore; extremitate antica rotundata, obtuse biangulata; 

 costa umbonali subcarinat-a flexuraque ventraH conspicuis ; liga- 

 mento longo, infosso ; dcntibus lateralibus parvis, antico subap- 

 proximato. 



Oboval, rather tlrin, somewhat ventricose, tortuous, nearly equi- 

 lateral, dull white, with regular raised and moderately distant con- 

 centric sublamellar striae ; the ventral margin arcuated, and rising 

 behind; anterior side very slightly the longer, its extremity 

 rounded, its dorsal edge near the short but distinct lunule in- 

 curved and scarcely sloping ; extremity of the posterior side ob- 

 tusely biangulated, its dorsal slope the more elevated slightly 

 convex and moderately sloping ; ligament elongated and sunken ; 

 tunbonal ridge subcarinated, and as well as the ventral fold, very 

 distinct ; inside white ; lateral teeth small, the anterior the more 

 approximate. 



Hab. ? Mus. Cuming, Metcalfe. 



89. Tellina ctrystallina (pi. lvii. f. 43.) Chem. vol. 11. 

 p. 210. f. 1947, 1948 ; Hani. Des. Cat, p. GO. t. 3. f. 10 ; Wood, 

 Gen. Conch, p. 149. 



T. testa obovata, tenui, hiEequivalvi, inajcjuilaterali, convexius- 

 cula, nitida, submargaritacea, Candida, subpellucida, lamellis sub- 

 remotis concentricis undique ornata ; interstitiis laevibus ; margine 

 ventrali valde arcuato, postice brevi et incurvato ; latere antico 

 longiore, rotundato ; postico brevi, rostrato ; natibus acutis ; liga- 

 mento minimo, infosso ; costa umbonali distincta ; dentibus latera- 

 libus distinctis, subsequidistantibus. 



Obovate, thin, inequivalve, inequilateral, moderately convex, 

 glossy, pure white, subnacreous, with distant regular raised con- 

 centric striae, the interstices quite smooth ; ventral edge greatly 



