DONAX. 



Plate VIII. 



Species 50. (Mus. Cuming.) 



DoNAX Madagascakiensis. Bon. testa abbreviato-tn- 

 angulari, pecuUariter diagonaliter mulato-coatatd, la- 

 tere postieo abrupte plano-angulato, interstitiis area' 

 cancellatis, antico compresse angulato-acuminato ; al- 

 bidd, epiderniide fulvd induid. 



The Madagascar Donax. Shell shortly triangular, 

 peculiarly diagonally wave-ribbed, posterior side 

 abruptly flatly angled, interstices of the area can- 

 cellated, anterior compressly angularly acuminated; 

 whitish, covered with a fulvous epidermis. 



Wood, Index Testaceologicus, Supp. Donax, fig. 3. 

 Donax Keyi, A. Adams. 



Hab. Madagascar. 



Peculiarly characterized by a sculpture of diagonally 

 cross-waved ribs. 



Species 51. (Mus. Cuming.) 



Donax petallina. Don. testa siiliangitste oblongd, tenui, 

 sendpellucidd, subaquilaterali, inimitissime radiatim 

 striata, pellucido-albd, pwrpurascente late biradiatd ; 

 lateribus rotundatis, subaqualibus, postieo latiore ; 

 umbonibiis parvis, siibcentralibus. 



The little petal Donas. Shell rather narrowly 

 oblong, thin, semitransparent, nearly equilateral, 

 very minutely radiately striated, transparent-white, 

 broadly two-rayed with light purple ; sides rounded, 

 nearly equal, posterior the broader; umboes small, 

 nearly central. 



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



Hab. ? 



A very delicate subtransparent shell, marked with two 

 broad rays of light purple, with the sides nearly equal. 



Species 52. (Mus. Cuming.) 



Donax ^nea. Don. testa anguste oblongd, striis sub letite 

 mumtissime decmsatd, sordidi alba, obscure biradiatd, 

 eximie iridescente ; latere antico acuminato-rotundato, 

 postieo obtuse declivi-angulato. 



The bkass Donax. Shell narrowly oblong, beneath the 

 lens very minutely decussated with strise; dirty- 

 white, faintly two-rayed, delicately iridescent ; an- 



terior side acuminately rounded, posterior obtusely 



slantingly angled. 

 MoKCH, Kierulf Cat. ; Deshayes, Pro. Zool. Soc. March, 



1854. 



Hab. ? 



A minute dull white shell, apparently smooth, but de- 

 cussated beneath the lens with fine striae and delicately 

 iridescent. 



Species 53. (Mus. Cuming.) 



Donax incarnata. Don. testa latissime trigond, solidi- 

 uscnld, compressd, obscure radiatim sulcatd, posticii 

 conspicne midato-corrugatd, interstitiis cancellatis; 

 lutescente-incarnatd ; latere antico subacuminato, pos- 

 tieo brevissimo, obtuse angnlato. 



The flesh-tinted Donax. Shell very broadly trian- 

 gular, rather soUd, compressed, obscurely radiately 

 grooved, posteriorly conspicuously wave -wrinkled, 

 with the interstices cancellated; yellowish flesh- 

 tinged ; anterior side subacuminated, posterior very 

 short, obtusely angled. 



Chemnitz, Conch. Cab. vol. vi. p. 265. pi. 26. f. 259. 



Hah. ? 



Of a particularly broadly angled form, the umboes 

 seeming unusually elevated, with the obtuse posterior 

 angle strongly diagonally wave-wrinkled. 



Species 54. (Mus. Cuming.) 



Donax Dysoni. Don. testd trigono-cuneatd, minntissime 

 decimatim striata, postice fortiter concentrice liratd, 

 interstitiis cancellatis; albidd, ad umboues livido- 

 purpurascente radiatd; latere antico rotimdato, postieo 

 brevissimo, vix angulato. 



Dyson's Donax. Shell triangularly wedge-shaped, very 

 minutely decussately striated, posteriorly strongly 

 concentrically ridged, with the interstices cancellated ; 

 whitish, rayed at the umboes with livid purple ; an- 

 terior side rounded, posterior veiy short, scarcely 

 angled. 



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



Hab. Indian Seas. 



Allied in general plan of sculpture to the preceding 



October, 1854. 



