239 



altera in valvula undique) decussantibus ; margine ventrali sub- 

 recto ; dorsali utrinque leviter et sequaliter subdeclivi ; extremitate 

 postica obtusissime angulata ; flexura ventrali costaque umbonali, 

 obsoletis ; ligamento prominente ; dente laterali antico approximato 

 et conspicuo, postico parvo^ remoto, inconspicuo. 



Oblong elliptic, equilateral, solid, compressed, rather glossy, 

 both internally and externally of an uniform reddish lilac colour, 

 the surface decussated by close-set concentric sulci and fine but 

 very distinct radiating striae, which ai-e only visible at the extreme 

 sides in one of the valves ; the ventral edge nearly straight ; the 

 dorsal slopes gentle and all but equal ; the posterior end most ob- 

 tusely angulated ; umbonal ridge and flexure obsolete ; the anterior 

 lateral tooth extremely close and distinct, the posterior very distant 

 and inconspicuous. 



Not readily confused with any in tliis division, but very closely 

 allied to Purpurascens, from wliich the teeth distinguish it. 



Tumbez, Peru; (Cuming). 



33. Telllna punicea (pi. Iviii. f. 89. and pi. Ix. f. 154.) 

 Born, p. 33. t. 2. f. 2; Lam. no. 21 ; Enc. Meth. t. 291. f. 2; 

 Gmel. 3239 ; Dil. Des. Cat. p. 90. 



T. testa ovali-trigona, sohda, convexiuscula, suba3quilaterali, 

 nitida, extus intusque albido-rosea, (rarius Candida) prope nates 

 albas colore saturatius tincta ; concentrice sulcata, sulcis confertis, 

 nonnunquam altera in valvula postice obsoletis; margine ven- 

 trali convexiusculo ; dorsali utrinque dechvi, antice convexiusculo, 

 postice subrecto ; extremitate antica obtusa, et superne subemar- 

 ginata ; latere postico trmicato-cuneiformi : flexura costaque um- 

 bonah inconspicuis ; ligamento prominulo aut prominente ; denti- 

 bus lateralibus distinctis, antico valde approximato, postico remote. 



Var. ? Magis trigona, teuuiore, saturatius picta, sulcis alterius 

 valvulse postice obsoletissimis, emarginatione subobsoleta. 



Subtriangularly oval, soKd, moderately convex, nearly equilateral, 

 glossy, of a pale rose-colour, increasing in intensity near the wliite- 

 tipped beaks ; surface closely and deeply grooved (the sulci rarely 

 obsolete behind) ; ventral edge slightly convex ; anterior side (if 

 either) the shorter, the extremity obtusely emarginated or indented 

 near the dorsal slope, which is shght and rather convex ; posterior 

 side of a truncate wedge shape, its dorsal edge nearly straight and 

 much sloping ; fold and flexure obsolete ; ligament always more or 

 less prominent ; lateral teeth distinct, the front one approximate, 

 the hinder remote. 



Var. ? more triangular, thinner, deeper coloured ; the sulci pos- 



o2 



