285 



rotundato ; extremitate postica obtuse cuneit'ormi ; Hexura costaque 

 umbonali subobsoletis ; ligamento satis prominente ; dentc latcrali 

 distincto, subapproximato. 



Suboval, inequilateral, rather compressed, very thin, pellucid, 

 white, with regular and not very close oblique stria3 ; ventral edge 

 nearly straight ; dorsal margin more or less convex and not greatly 

 sloping in front, nearly straight and moderately sloping behind ; 

 anterior side the longer, rounded; posterior extremity obtusely 

 wedge-shaped ; ligament moderately prominent ; fold and flexure 

 obsolete ; lateral tooth distinct, subapproximate. 



Chiriqui, West Columbia. 



119. Tellina stmilis (pi. lvii. f. 65.) Sowerhj, Brit. Miscel. 

 pi. 75 ; Mont. Test. Brit. Sup. p. 167; Turt. Biv. Brit. p. 102; 

 Philip. A.b. und Bes. Conch, part 9. pi. 5. f. 7. 



T. testa subovali, solidiuscula, inajquilaterali, convexa, nitida, 

 extus intusque albida, concentrice et oblique striata; striis obli- 

 quis, minutis, confertissimis ; ultima parte postica altera in val- 

 vula sublaevigata, in altera autem striis subimbricatis haudque 

 confertis concentrice exarata ; margine ventrah subrecto ; dorsali 

 antice convexiusculo, postice brevi subretuso, utrinque paululum 

 dechvi; latere antico longiore, rotundato; extremitate postica 

 obtuse biangulata, ; costa umbonah satis conspicua ; hgamento 

 prominente ; dente laterali magno, approximato. 



Suboval, moderately strong, inequilateral, convex, glossy, whitish 

 botli within and without, with a few concentric and crowded mi- 

 nute oblique striae, which do not extend to the obtuse hinder 

 extremity, but are replaced before reacliing the distinct umbonal 

 ridge, by not very close subimbricated stria? (obsolete in one of the 

 valves) ; ventral edge straightish ; dorsal not greatly sloping on 

 either side, convex in front, short and retuse behind ; anterior side 

 the longer, rounded; ligament prominent; lateral tooth large, 

 approximate. 



West Indies. 



120. Tellina decoea (pi. lvi. f. 27., lix. f. 127., and lxvi. 

 f. 260.) Say, Jour. Acad. Philad. voL v. 



T. testa, T. simili simillima, sed minore, magis convexa, magis 

 insequilaterali, radiis angustis roseis ornata ; margine cardinali roseo 

 sub ligamento. 



Very like a young Stmilis (of winch it may possibly prove a 

 variety), but decidedly more convex than specimens in that stage, 

 and when adult much more inequilateral than full grown shells of 



u 



