228 



trato ; extremitate postica angulata ; costa umbonali prominente ; 

 natibus plerumque purpureis ; umbonibus fiavis; ligamento magno ; 

 superficie interna flavida; dentibus lateralibus magnis, subsequi- 

 distantibus. 



Var. Testa, angustiore; sulcis remotioribus ; margine ventrali 

 rectiore, dorsali utrinque minus declivi. 



Oval or oval-oblong, equilateral, solid, subventricose, not po- 

 lished, white crowded with narrow zigzag linear streaks of fawn- 

 colour brown chocolate or purple, beaks usually tipped with purple, 

 umboncs yellowish ; surface with moderately distant raised con- 

 centric sulci, wlrich become more elevated but not thickened on the 

 conspicuous umbonal ridge; ventral edge moderately arcuated; 

 anterior side rounded at its extremity, the dorsal slope gentle ; 

 posterior side attenuated, subrostrated, the slope strong and very 

 slightly convex, the tip obtusely angulated ; inside tinged with yel- 

 low ; lateral teeth very strong, subequidistant. 



Var. Narrower and more elongated ; dorsal edges less sloping ; 

 ventral edge straighter ; sulci rather more distant. 



Surinam. The T. Mexicana of the ' Eevue Cuverienne/ is now 

 regarded by its author as an elongated variety of this species. 



12. Tellina virgata (pi. lxiii. f. 212.) Lin. Sys., p. 1116; 

 Chem. vol. vi. f. 67 ; Enc. Meth. t. 288. f. 2 ; Mawe's Conch, t. 6. 

 f. 1 ; Lam. no. 5 ; Hani. Des. Cat. p. 61. t. 3. f. 3; Wood, Gen. 

 Cone. t. 35. f. 2, 3. 



T. testa ovali, subtrigona, solida, convexiuscula, subgequilaterali, 

 flava, roseo-purpurascente radiata, concentrice sulcata, ; sulcis an- 

 tice subimbricatis, postice rudioribus magisque elevatis ; margine 

 ventrali postice sursum acclinato, medio subrecto, antice arcuato, 

 carina umbonali prominente; latere antico breviore, rotundato; 

 postico attenuato, subrostrato ; margine dorsali postico elongato, de- 

 clivi, subincurvato ; ligamento magno ; superficie interna aurantio 

 tincta ; dentibus lateralibus validis, subsequidistantibus. 



Oval, subtriangular, sohd, moderately convex, nearly equilateral, 

 rich yellow, either uniform, or closely rayed with dull purplish crim- 

 son ; the concentric sulci becoming closer and slightly imbricated 

 anteriorly, and coarser more prominent and distant as they approach 

 the projecting umbonal ridge ; ventral edge subarcuated in front, 

 nearly straight in the middle, and sloping up towards the attenuated 

 and subrostrated posterior extremity ; ligamental edge somewhat 

 incurved, much sloping; ligament large and prominent; within 

 usually tinged with orange, the lateral teeth strong and subequi- 

 distant. 



Indian Ocean. 



