270 



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

 beaks prominent^ acute; ligament sunken; umbonal ridge very 

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

 the more distant. 

 Ceylon. 



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

 Meth. t. 287. f. 3. 



T. testa obovah, tenuiuscula, subventricosa, tortuosa, sequilate- 

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

 centrice ornata; margine veutrali arcuato, postice sursum accli- 

 nato; dorsaJi utrinque paululum declivi, antice convexo (sed 

 juxta lunulam brevem distinctam iucuiTato), postice convexiusculo 

 et elevatiore; extremitate antica rotundata, obtuse biang-ulata; 

 costa umbonaJi subcarinata flexui'aque ventrali conspicuis ; hga- 

 mento longo, infosso; dentibus lateraHbus parvis, antico subap- 

 proximato. 



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

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

 centric sublameUar strise ; the ventral margin arcuated, and rising 

 behind; anterior side very shghtly 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 shghtly 

 convex and moderately sloping ; ligament elongated and sunken ; 

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

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

 approximate. 



Hab. ? Mus. Cuming, Metcalfe. 



89. Tellina crystallina (pi. Ivii. f. 43.) Chem. vol. 11. 

 p. 210. f. 1947, 1948 ; Hani. Des. Cat. p. 66. t. 3. f. 10 ; Wood, 

 Gen. Conch, p. 149. 



T. testa obovata, tenui, insequivalvi, infequilaterah, convexius- 

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

 remotis concentricis undique ornata ; interstitiis Isevibus ; margine 

 ventrah valde arcuato, postice brevi et incurvato; latere antico 

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

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

 hbus distinctis, subaequidistantibus. 



Obovate, thin, inequ.ivalve, inequilateral, moderately convex, 

 glossy, pure wliite, subnacreous, \\ath distant regular raised con- 

 centric striae, the interstices quite smooth ; ventral edge greatly 



