265 



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

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

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

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

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

 Island of Ticao. 



78. Tellina crassa (pi. lxi. f. 169, 173.) Pennant, Brit. 

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

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

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

 vol. 3. 1. 103. 



T. testa rotundato-ovali, subobliqua, solida, insequivalvi, sub veil - 

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

 sulcis rudibus concentrice exarata ; margine ventrali arcuato ; dor- 

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

 latere antico longiore, rotundato, prominente ; postico abbreviate, 

 ad extremitatem obtuso ; costa nmbonah obsoleta ; natibus incum- 

 bentibus j lunula parvti, excavata ; ligamento infosso ; flexura dis- 

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

 dentibus laterahbus magnis, antico subapproximato ; cicatricibus 

 muscularibus profunde impressis. 



Roundish oval, slightly oblique, inequivalve, very inequilateral, 

 rather ventricose, dull 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 imibonal 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. 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, subaequilaterali, impolita,, 

 intus extusque albida, lamellis confertis coucentricis undique as- 

 perata ; interstitiis lsevibus ; margine ventrali arcuato ; dorsali utrin- 

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



