36 TESTACEOUS MOLLUSCA. 



C. Donacina. Lam. 2. — Reeve. Ie. f 19.— Del. t. 4. f. 1. 



Ovate-triangular, very inaequilateral, the posterior side being the 

 shorter and rounded, gibbous, with small transverse striae and a 

 thin reddish-brown epidermis ; beaks smooth and the depressions 

 sunken — New Holland. — Variety. The beaks with wrinkled 

 plaits. 



C. Sulcata. Lam. 3.— Reeve. Lc. f. 6. Triangularly-ovate, 

 very inaequilateral, 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.— Sow. G.f 1 $3.—E. t. 253./. 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 

 oryellow under a brown epidermis with fine and scarcely apparent ver- 

 tical rays, inner margin crenulated. 1^.-2. — S. America? Ceylon? 



C. Subradiata. Lam. 6. — An. Reeve. Ic.f. 15. ? Triangular, 

 sub-aequilateral, transversely grooved, greyish fulvous with obsolete 

 white interrupted rays, -f — South Seas. — Not unlike Ch.f. 222, 

 and very closely akin to the next species. 



C. Contraria. Lam. 7. — Venus C. Gm. 327.— D. p. 200. 

 — Ch.f. 317, 8, 9.— Reeve. Ic.f 18. - W. t. S.f 95. Triangularly 

 ovate, tumid, white or reddish fulvous, variegated wth chesnut 

 spots ; anterior portion with transverse, posterior with obliquely 

 longitudinal striae : inside with a purplish tinge, especially towards 

 the border which is crenulated : beaks coloured. — Variety. White 

 with rufous flexuous spots: beaks livid. — Variety. Reddish ful- 

 vous with varied brown spots : beaks red. -|.— Guinea ; Canaries. 



C. Castanea. Reeve. Z. P. 1841. fy 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 ..3^. — N. Holland. 



C. Decipiens. Z. P. 1841. $ lc. f 4.— C. Kingicola. 

 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 striae. 2J..2|. — New 

 Holland. 



C. Pulchra. 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.. 2-J. — N. Holland. 

 Allied to Sulcata. 



C. Lapidea. Reeve. Z. P. 1841. fy Ic.f. 7. Ovate-orbicular, 

 aneriorly sub-angulated, posteriorly marked with some short striae, 



