36 TESTACEOUS MOLLUSCA. 



C, DoNACiNA. Lam. 2. — Reeve. Ic. f. 19. — Del. t. 4. f. 1. 

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

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

 thin reddish-brown epidermis ; beaks smooth and the depressions 

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

 plaits. 



C. Sulcata, Lam. {i.~ Reeve. Lc. f. 6. Triangularly-ovate, 

 very insequilateral, 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. I <^'3.—E. t. 253./. 2.— 

 Reeve. Ic.f. 10. — An. Del. t. 4. / 2, 3. ? Ovate-trinngular, an- 

 terior side rather produced and siib-angular, smooth, beaked, fulvous 

 or yellow under a brown epidermis with fine and scarcely apparent ver- 

 tical rays, inner margin crenulated. li..2. — S. America? Ceylon? 



C. Subradiata. I^am. 6. -An. Reeve, lc. f. If). ? Triangular, 

 sub-sequilateral, transversely grooved, greyish fulvous with obsolete 

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

 and very closely akin to the next species. 



C. CoNTRARiA. L^am. 7- — Venus C. Gm. 327. — D. p. 200. 

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

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

 spots ; anterior portion with transverse, posterior with obliquely 

 longitudinal striae : inside with a purplish tinge, es2:)ecially 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. \84l. if Ico7i. 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. 4- Ic. 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. 2|^..2|^. — New 

 Holland. 



C. PuLCHRA. Reeve. Z. P. 1841. if 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|^. — N. Holland. 

 Allied to Sulcata. 



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

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



