DONAX.— Plate IV. 



Lamarck, Anim. sans vert. (Deshayes' edit.) vol. vi. p. 



245. 

 Hub. Panama and St. Elena, West Columbia ; Cuming. 



An interesting species of regular wedge-form, variously 

 coloured. 



Species 2.3. (Fig. a, h, Mus. Cuming.) 



DoNAX TRUNCULDS. Bon. tedd eloiigato-oblonfjd, convexd, 

 soUdiusciild, postice leviter siniwsd, radiatim striatd, 

 versus marginem leviter sulcata ; alhidd, epidermkle 

 fulvescente indutd, interditm radlald, nitente ; latere 

 antico rotundato, postice breviter obtuse aiigulato, sub- 

 truncato. 



The truncated Donax. Shell elongately oblong, con- 

 vex, rather solid, slightly sinuous posteriorly, radiately 

 striated, striae slightly grooved towards the margin ; 

 whitish, covered with a fulvous horny epidermis, 

 sometimes rayed, shining ; anterior side rounded, 

 posterior shortly obtusely angled, slightly truncated. 



LiNN^TJS, Syst. Nat. (12th edit.) p. 1127. 

 Donax vemista. Poll. 

 Donax longa, Broun. 

 Douax hiradiaia and scxradiata, Wood. 



Hah. European Seas. 



Of stout, oblong, rather solid growth, sometimes plain, 

 sometimes rayed. 



Species 2'i. (Mus. Cuming.) 



Donax contusa. Don., tedd elongato-oblongd, siibflex- 

 nosd, obsolete radiatiiu sulcatd, sulcis nmnerosis, versus 

 wiihuiies evauidis ; fulvescente-albd, umbonibus rufes- 

 ceidilms, pallide ndiatis; zimbouibus subcentralibtis ; 



latere antico rotundato, postico obtuse Jlexuoso-rostrato, 

 vix truncato. 



The bruised Donax. Shell elongately oblong, rather 

 flexuous, obsoletely radiately grooved, grooves nume- 

 rous, fading towards the umboes ; fulvous white, 

 umboes reddish, pale-rayed; umboes nearly central, 

 anterior side rounded, posterior obtusely flexuously 

 beaked, scarcely truncated. 



Hab. Mazatlan, Gulf of California. 



Of an oblong bean-shaped form, scarcely truncated on 

 the posterior side, with the umboes nearly central, and 

 peculiarly white-rayed on a purple-red gi'ound. 



Species 25. (Mus. Cuming.) 



Donax semistriata. Boyi. testa subtrigono-oblonga, me- 

 dio gibbosd, radiatim Uneari-sulcatd, striis concentricis 

 sub latus posticum decussatd ; albidd, pallide earned 

 obscure radiatd, epidermide fulvescente corned versus 

 marginem indutd ; latere antico subacmninato-rotun- 

 dato, postico subjlexuoso, obtuse declivi-angidato. 



The half-striated Donax. Shell somewhat triangu- 

 larly oblong, gibbous in the middle, radiately linearly 

 grooved, decussated with concentric strise on the 

 posterior side ; whitish, obscurely rayed with pale 

 flesh, covered towards the margin with a fulvous 

 horny epidermis ; anterior side somewhat acuminately 

 rounded, posterior subflexuous, obtusely slantingly 

 angled. 



PoLi, Test. Sicilies, pi. 3. f. 12. 

 Bonax fabagella, Lamarck. 



Hab. Mediterranean. 



The posterior side of this species is decussated by a row 



of concentric grooved stria3. 



