265 



acute beaks and then straightisli, (or slightly convex), and mode- 

 rately sloping ; posterior side short, and armed at its extremity with 

 two or three rows of rachating serrated spines, its dorsal edge con- 

 vex and sloping; ligament sunken; a small distinct lunide; inside 

 white, the anterior lateral tooth slightly the closer, posterior distant. 

 Island of Ticao. 



78. Tellina cbassa (pi. Ixi. f. 169, 173.) Pennant, Brit. 

 Zool. vol. iv. p. 73. t. 48. f. 28 ; Wood Gen. Cone. p. 186. t. 40. 

 f. 1 ; Turt. Biv. Brit. p. 109. t. 7 f. 2; Lam. no. 35 ; Hani. Des. 

 Cat. p. 68. t. 4. f. 75 ; List. t. 299. f. 136 ; T. rigida Don. Br. Sh. 

 vol. 3. t. 103. 



T. testa rotundato-ovah, subobliqua, soKda, inaequivalvi, subven- 

 tricosa, impoKta, albida, radiis angustis rubris plerumque ornata, 

 sulcis rudibus concentrice exarata; margine ventrali arcuato; dor- 

 sah utriuque declivi, convexo, postice elevatiore, antice convexiore ; 

 latere antico longiore, rotmidato, prominente ; postico abbreviato, 

 ad extremitatem obtuso ; costa umbonali obsoleta ; natibus incum- 

 bentibus ; lunula parva, excavata ; ligamento infosso ; flexura dis- 

 tincta; superficie interna plerumque aurantia, (rarius albida); 

 dentibus laterahbus magnis, antico subapproximato ; cicatricibus 

 muscularibus profunde impressis. 



Eoundish oval, slightly obKque, inequivalve, very inequilateral, 

 rather ventricose, duU white, almost always adorned N\ith narrow 

 red rays, and concentrically and coarsely grooved ; the ventral edge 

 arcuated ; the anterior side the longer, its dorsal edge arcuated, 

 its extremity rounded and projecting; the posterior side rather 

 short, its dorsal slope very sudden and very convex, its tips most 

 obtusely subangulated ; the umbonal ridge obsolete; ligament 

 sunken; fold distinct; the beaks recurved anteriorwards ; the 

 lunule small and excavated ; inside usually stained with orange, very 

 rarely white ; the lateral teeth large, the anterior one rather approx- 

 imate ; muscular impressions deeply impressed. 



Britain; Europe. 



The T. wacnlata of Turton (Biv. Brit.) is a young discoloured 

 specimen of this species. 



79. Tellina plectrum (pi. Ixi. f. 177.) Hanley, Zool. Proc. 

 1845. 



T, testa obovata, solida, convexiuscula, subsequilaterah, impohta, 

 intus extusque albida, lameUis confertis concentricis undique as- 

 perata ; interstitiis Isevibus ; margine ventrali arcuato ; dorsab utriu- 

 que subrecto, subdeclivi (in junioribus declivi) ; extremitate antica 



