!! 



DONAX.— Plate VIII. 



species, in that the well-defined posterior ridges are not 

 wrinkled. 



Species 55. (Mus. Cuming.) 



DoNAX PAXILLUS. Don. testa, elongato-cuneatd, Icemgatd, 

 obscure radiat'mi sulcata, ; albidd, Imdo-tinctd ; latere 

 atitico acummato-rotnndato, postico brevissimo, latiiis- 

 culo, abrupte angtdato-truncato, ad angulum cremi- 

 lato ; area siMilissime granoso-decussatd. 



The little peg Donax. Shell elongately wedge-shaped, 

 smooth, obscurely radiately grooved ; whitish, livid 

 stained ; anterior side acuminately rounded, posterior 

 very short, rather wide, abruptly angularly truncated, 

 crenulated at the angle; area finely granosely de- 

 cussated. 



Hai. Ceylon. 



Of a somewhat sharply elongated wedge-shape, crenu- 

 lated on the abrupt posterior angle. 



Species 56. (Mus. Cuming.) 



Donax semisulcata. Boji. testd abbreviato-cuneiformi, 

 solidiusculd, lutescente, antici IcBvigatd, politd, postice 

 lirato-elathratd ; latere aidico acuminato-rotmidato, 

 postico brevissimo abrtipte concavo-iruncato, acute cre- 

 nato-angn.lato ; area uitidissime granato-Uratd. 



The half-grooved Donax. Shell shortly wedge-shaped, 

 rather solid, yellowish, anteriorly smooth, polished, 

 posteriorly conspicuously ridge-latticed ; anterior side 

 acuminately rounded, posterior very short, abruptly 

 concavely truncated, sharply crenately angled ; area 

 very neatly grain-ridged. 



Hanley, Pro. Zool. Soc. 184-3, p. 5. 



Eab. East Africa. 



Of a sharply angled wedge-form, beautifully lattice- 

 sculptured on the posterior side. 



Species 57. (Mus. Cuming.) 



Donax clatheata. Don. testa ohlongo-cuneatd, gibbo- 

 suld, albidd, nndique pulclterrime granoso-elathratd ; 



latere atitico rotundato, postico brevissimo, latiusculo, 

 abrupte truncato, ad angulum bicarinato. 

 The latticed Donax. Shell oblong, wedge-shaped, 

 rather gibbous, whitish, beautifuUy grain-latticed 

 throughout; anterior side rounded, posterior very 

 short, rather broad, abruptly truncated, two-keeled 

 at the angle. 

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



Hab. ? 



Delicately grain-latticed throughout, with two charac- 

 teristic though slight keels on the posterior angles. 



I 



Species 58. (Mus. Cuming.) 



Donax acuminata. Don. testd acute angulato-cuneatd, 

 medio gibbosiusculd, dense radiatim sulcata; albidS, 

 latere antico acuminato, postico acute declivi-angulato, 

 latiusculo. 



The acuminated Donax. Shell sharply angularly 

 wedge-shaped, rather gibbous in the middle, densely 

 radiately grooved ; whitish, anterior side acuminated, 

 posterior shai-ply slantingly angled, rather broad. 



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



Hab. ? 



Chiefly distinguished by the anterior side being more 



than usually attenuated and acuminated. 



Species 59. (Mus. Cuming.) 



Donax Nuculoides. Don. testd subquadrato-ovatd, pla- ^ 

 no-convexd, solidiusculd; albidd, epidermide corned I 

 cinered nitente induid; lateribus rotundatis, postico 

 breviore, vix truncato. 



The Nucdla-like Donax. Shell somewhat squarely 

 ovate, flatly convex, rather solid ; white, covered 

 with a shining homy-ash epidermis ; sides rounded, 

 posterior the shorter, scarcely truncated. 



Hab. Bodegas, California; Hinds. 



Of very distinct typical character from any other species 

 of the genus, fiatly convex, covered with a shining horny 

 epidermis, and having somewhat of the external aspect of 

 Nucula. 



