324 



lida, subventricosa, subimpolita, sublsevigata, extiis intusque albida^ 

 umboiiibiis aurantio-roseis ; margine ventrali subrecto aut puulu- 

 lum convexo ; dorsali antico vix declivi et prope nates prominulas 

 subretuso, deinde magis minusve convexo; margiiie ligamentali 

 declivi, subrecto ; extremitate antica rotundata ; latere postico 

 breviore, obtuse cuneifornai ; flexura, subobsoleta, (rarius distincta) ; 

 ligamento infosso. 



Var. Testa majore, impoKta, opaca, concentrice subrugosa, 

 umbonibus baud erubescentibus ; flexura costaque umbonaH dis- 

 tinctis. 



Varying in form from obovate to oval, more or less solid, rather 

 ventricose, rarely at aU glossy, wliitisli with the umbones reddish 

 crimson, nearly smooth, (in fuU grown individuals with a few con- 

 centric strife near the scarcely convex ventral margin, whose flexure 

 is rarely distinct) ; anterior side the longer, sometimes greatly, at 

 others scarcely so, its dorsal edge for about half its length from 

 the rather prominent beaks somewhat refuse and nearly parallel 

 to the lower edge, thence declining in a convex slope to the 

 rounded termination ; hinder extremity more or less obtusely 

 wedge-shaped, the ligamental edge sloping strongly, and being 

 more or less straight ; ligament sunken ; the inner disk red ; one 

 umbone projecting beyond the other. 



Var. Larger, dull, opaque, the umbones not colom'ed, the sur- 

 face somewhat wrinkled concentrically ; fold and flexure distinct. 



Panama, the variety from Tumbez. 



200. Tellina angulata (pi. Ixv. f. 250.) Chemnitz, vol. \\. 

 p. 89. f. 74, 75 ; Wood, Gen. Conch, p. 146. t. 43. f. 1 ; Sclu-oet. 

 Einl. vol. ii. t. 7. f. 8 ; Lutraria Tellinoides, Lam.; Deles, t.3. f. 5; 

 Hani. Des. Cat. p. 27. sup. t. 11. f. 33. 



T. testa subovali, insequivalvi, solidiuscula, inseqiulaterali, con- 

 vexa aut subventricosa, extus intusque alba, subleevigata ; margine 

 ventrali subrecto aut convexiusculo ; dorsali utrinque paulidum 

 declivi aut subdecHvi et subrecto, postice elevatiore, antice prope 

 nates subincm-vato ; latere antico obtuso aut rotundato, longiore ; 

 extremitate postica obtusa, subattenuata, aut obtussime biangu- 

 lata; natibus prominentibus incurvatis, acutis; costa umbonali 

 satis distincta ; ligamento parvo, angusto, infosso ; dentibus ob- 

 soletis. 



Somewhat oval, inequivalve, tolerably strong, moderately inequi- 

 lateral, convex or subventricose, wlute both within and without, 

 nearly smooth ; ventral edge straightish or but slightly convex ; 

 anterior side the longer, its extremity rounded when the straightish 



