265 



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

 rately sloping ; posterior side short, and armed at its extremity A\ith 

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

 vex and sloping ; Ligament sunken ; a small cUstinct lunule ; inside 

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

 Island of Ticao. 



78. Tellina crassa (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 Bon. Br. Sh. 

 vol. 3. 1. 103. 



T. testa rotundato-ovali, subobliqua, solida, insequivalvi, subven- 

 tricosa, impoHta, albida, radiis angustis rubris plermnque ornata, 

 sulcis rudibus concentrice exarata ; margine ventraH arcuato ; dor- 

 sali utrinque declivi, convexo, postice elevatiore, antice convexiore ; 

 latere antico longiore, rotmidato, prominente ; postico abbrcviato, 

 ad extremitatem obtuso ; costa umbonaH obsoleta ; natibus incum- 

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

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

 dentibus laterahbus magnis, antico subapproximato ; cicatricibus 

 muscularibus profunde impressis. 



Eoundish oval, slightly obhque, inequivalve, very inequilateral, 

 rather ventricose, duU white, almost always adorned with 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 reciu-ved anteriorwards ; the 

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

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

 imate ; muscidar impressions deeply impressed. 



Britain; Europe. 



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

 specimen of this species. 



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

 1845. 



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

 intus extusquc albida, lameUis confertis concentricis imdique as- 

 perata ; intcrstitiis la^vibus ; margine ventrali arcuato ; dorsali utrin- 

 que subrccto, subdcclivi (in junioribus dechvi) ; extremitate antica 



