CALYPTRiEA. 463 



CALYPTR^EA, Lamarck. 



Shell conical, entire, depressed, subspiral, with a central 

 vertex ; surface smooth, or scaly ; interior with a par- 

 tition. 



Animal with a broad and slightly produced muzzle ; 

 tentacula two, rather short, lanceolate, unconnected, with 

 the eyes on bulgings at their external bases ; mantle with a 

 simple edge : branchial plume single ; foot suborbicular, 

 slightly angled in front, its sides plain. Tongue constituted 

 like that of Pileoims (?) 



This is a southern and tropical genus, of which the 

 only species inhabiting our seas is one on the very bounds 

 of the region inhabited by the tribe. In tropical seas 

 the forms of Calyptraa are very curious and varied. 

 Unlike Pileopsis, the group is of comparatively recent 

 origin, beginning, at earliest, during the later secondary 

 epoch, and multiplying as it approached the present 

 era. 



C. Sinensis, Linnaeus. 

 Plate LX. fig. 3, 4, 5, .and (Animal) Plate B.B, fig, 8 to 13. 



Humph, and Da Cos. N. H. Shells, pi. 6, f. 11, 12.— Born, 

 Testae. Mus. Caas. Vind. p. 414, vign. fig. e. 

 Patella Cliinensis, Linn. Syst. Nat. ed. 12, p. 1257. — Mont. Test. Brit. vol. ii. 

 p. 489, pi. 13, f. 4. — Maton and Rack. Trans. Linn. Soc. 

 vol. viii. p. 228 — Turt. Gonch. Diction, p. 134, f. 29, 30. 

 „ albida, Donovan, Brit. Shells, vol. iv. pi. 129. 



„ Sinensis, Dillw. Recent Shells, vol. ii. p. 1017. — Wood, Index Testae, 

 pi. 37, f. 4. 

 Calyptrea laevigata, Lam. Anim. s. Vert. (ed. Desh.) vol. vii. p. 623. 

 Trochita Cliinensis, Schumacher, Syst. Vers, Testae. (1817), p. 184. 

 Calyptnra Cliinensis, Fleming, Brit. Animals, p. 3G2. — Brit. Marine Conch, p. 

 13G. — S. Wood, Crag Mollusca (fossil), pi. 18, f. 1, 



