36 TESTACEOUS MOLLUSCA. 
C. Donacina. Lam. 2.—Reeve. Ie. f. 19.—Del. t. 4. f. 1. 
Ovate-triangular, very inequilateral, the posterior side being the 
shorter and rounded, gibbous, with small transverse strie and a 
thin reddish-brown epidermis; beaks smooth and the depressions 
sunken —New Holland.—Variety. The beaks with wrinkled 
plaits. 
C. Suncata. Lam. 3.—Reeve. Ic. f. 6. Triangularly-ovate, 
very inzequilateral, the anterior side being produced attenuated and 
angulated, the posterior rounded ; gibbous, plaited and grooved 
transversely, but the beaks nearly smooth.—New Holland.— 
Variety. More depressed and elegantly plaited. 
C. Rostrata. Lam.4.—Son. G.f. 1 §°3.—E. t. 253. f. 2.— 
Reeve. Ic. f. 10.—An. Del. t. 4. f 2,3.?  Ovate-triangular, an- 
terior side rather produced and sub-angular, smooth, beaked, fulvous 
or yellow under a brown epidermis with fine and scarcely apparent ver- 
tical rays, inner margin crenulated. 14..2.—S. America? Ceylon? 
C.Susravrta. Lam. 6.—An. Reeve. Ic. f.15.? Triangular, 
sub-sequilateral, transversely grooved, greyish fulvous with obsolete 
white interrupted rays. § —South Seas.—Not unlike Ch. f. 222, 
and very closely akin to the next species. 
C. Contrartia. Lam. 7.—Venus C. Gin, 327.—D. p. 200. 
—Ch. f.317, 8, 9.—Reeve. Ic. f. 18.- W. t. 8. f.95. Triangularly 
ovate, tumid, white or reddish fulvous, variegated wth chesnut 
spots ; anterior portion with transverse, posterior with obliquely 
longitudinal strize : inside with a purplish tinge, especially towards 
the border which is crenulated : beaks coloured.—Variety. White 
with rufous fiexuous spots: beaks livid.—Variety. Reddish ful- 
vous with varied brown spots: beaks red. 3.— Guinea ; Canaries. 
C.Castanrea. Reeve. Z. P. 1841. § Icon. f. 3.  Ovate-tri- 
angular, gibbous anteriorly angulated, posteriorly rounded ; the 
umbones distinctly eroded, the epidermis shining, horny and ches- 
nut ; inside somewhat fuscous. 3..33.—N. Holland. 
C. Decipiens. Z. P. 1841. § Ic. f. 4.—C. Kinercona. 
Reeve. Syst. t. 44. f. 3. Ovate, sub-gibbous, the epidermis brown, 
brilliantly rayed, the rays often extending to the ventral margin : 
anterior side slightly the more produced sub-quadrate, posterior 
sub-angulated and adorned with short strie. 22..21.— New 
Holland. 
C. Putcura. Reeve. Z. P. 1841. §& Ic. f. 16. Ovate-tri- 
angular, depressed, anteriorly but slightly produced and sub-angu- 
lated, posteriorly rounded: with obsolete rays and transverse very 
deep regular grooves running parallel to the lines of growth: 
epidermis thick fibrous and rather soft. 2..27.—N. Holland. 
Allied to Sulcata. 
C. Lapipea. Reeve. %. P.1841. § Ic. f.7. Ovate-orbicular, 
aneriorly sub-angulated, posteriorly marked with some short striz, 
