DON AX. 



Plate V. 



Species 26. (Pig. a, b, c, Mus. Cuming.) 



DoNAX KADIANS. Bon. testd trigouo-ovatd, soUdiusculd, 

 compressd, transversim striatd, varie coloratd, nunc 

 plumbed, albo lentiginosd, nunc lutescente-albd, nifo- 

 radiatd, inaqidlaterali, latere postico brevi, declivi, 

 antico acumhiato-rotundato . 



The rayed Donas. Shell triangularly ovate, rather 

 solid, compressed, transversely striated, variously 

 coloured, sometimes lead-coloured, freckled with 

 white, sometimes yellowish-white, rayed with red, 

 inequilateral, posterior side short and slanting, an- 

 terior acuminately rounded. 



Lamarck, Anim. sans vert. (Deshayes' edit.) vol. vi. p. 341. 



Hob. Philippine Islands ; Cuming. 



I have not given to this species the name of D.faba, 

 Chemnitz, because the figure in the ' Conchylien Cabinet,' 

 vol. vi. pi. 26. f. 267, has not the triangular form charac- 

 teristic of it. Lamarck has quoted that as a synonyme 

 in error. 



Species 27. (Mus. Cuming.) 



DoNAX Lamarckii. Bon. testd oblongo-ovatd, soUdius- 

 culd, gibbosd, radiatim undique dense liratd, carneo- 

 lutescente, latere antico lanceolato-rotundato, postico 

 late declivi-trmicato. 



Lamarck's Don ax. Shell oblong-ovate, rather solid, 

 gibbous, everywhere densely ridged, flesh-tinged 

 yellow, anterior side lanceolately rounded, posterior 

 broadly slantingly truncated. 



Deshayes, MSS. Mus. Cuming. 



Hab. ? 



A rather gibbous solid species, distinctly closely ridged 

 throughout in rays from the umboes. 



Species 28. (Fig. a, b, Mus. Cuming.) 



Donax bicoloe. Bon. testd ovato-cuneatd, cowpressius- 

 culd, concenlrice striata, striis posticis obsolete crispato- 

 granulatis, striis exiguis radiantibus decussatis, varie 

 coloratd, nunc rosaced, nunc albidd, plumbeo radiatd, 

 latere antico rotundato, postico compresse obtuse an- 

 gulato. 



The two-coloured Donax. Shell ovately wedge- 

 shaped, rather compressed, concentrically striated. 



the posterior striae obsoletely crisply granulated, de- 

 cussated with very fiue raised strife, variously coloured, 

 sometimes rose-tinted, sometimes whitish, rayed with 

 lead-colour, anterior side rounded, posteriorly com- 

 pressly obtusely angled. 



Lamarck, Anim. sans vert. (Deshayes' edit.) vol. vi. p. 243. 



Hab. Island of Negros, Philippines ; Cuming. 



Chiefly distinguished by its broad compressly ovate 

 form, and by the slight obtusely angled growth of the 

 posterior side. In colour it is one of the most variable 

 species of the genus. 



Species 29. (Mus. Cuming.) 



Donax Conradi. Bon. testd elongato-ovatd, gibbosius- 

 culd, ad marginem compressd, Icevigatd, radiatim cre- 

 brisulcatd, snlcis linearibus, liris intermediis posticis 

 minute serratis ; albidd, cinereo-fasdatd ; umbonibus 

 purpureis, alio maculatis ; lunula aredque posticd ci- 

 nereo-purpureis, latere antico elongato-rotmidato, pos- 

 tico sicbconcavo-trtmcato. 



Conrad's Donax. Shell elongately ovate, rather gib- 

 bous, compressed at the margin, smooth, radiately 

 closely grooved, grooves linear, the posterior inter- 

 mediate ridges minutely seiTated ; whitish, ash- 

 banded ; umboes purple, white-tipped ; lunule and 

 posterior area ash-purple, anterior side elongately 

 rounded, posterior rather concavely truncated. 



Deshayes, Pro. Zool. Soc. March, 1854. 



Hab. Gulf of California. 



An elongately oblong species, in which the posterior 

 side has a slightly arched beaked growth. 



Species 30. (Mus. Cuming.) 



Donax obesula. Bon. testd abrupte cuneatd, valde gib- 

 bosd, radiatim dense tenuiliratd, concentrice pulcJier- 

 rime tenuicancellatd, lutescente, latere antico peculia- 

 riter acuminata, postico late trnncato. 



The stout Donax. Shell abruptly wedge-shaped, very 

 gibbous, radiately densely finely ridged, concentri- 

 cally beautifully finely cancellated, yellowish, ante- 

 rior side peculiarly acuminated, posterior broadly 

 truncated. 



Deshayes, Pro. Zool. Soc. March, 1854. 



September, 1854. 



