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the trivial name given it by English Collectors. In 

 other species, as the O. gibbosa, the conformation of the 

 whorls more nearly resembles that of the Cypraeae, 

 but they exhibit no spire; the edge of the right margin , 

 always reflected inwards, either smooth or wrinkled; 

 no columella lip or plaits ; aperture longitudinal, nar- 

 row, extending the entire length of the shell, and ef- 

 fuse; no operculum or epidermis. By a parity of reason- 

 ing it may safely be concluded, that the animals inhabit- 

 ing the shells of this genus possess a mantle which 

 they have the power of extending over the whole ex- 

 terior surface of the shell, as is known to be the case 

 with the Cypreeae. This genus is the first of the six 

 genera, into which Lamarck has divided the shells 

 which are spirally evolved on their own axis, viz. 

 G. Ovula, G. Cypraea, G. Terebellum, G. Ancil- 

 laria, G. Oliva, and G. Conus. The two first, Ovula 

 and Cyprsea, have the right lip reflected inwardly. 

 The plate, fig. 1, referred to in Sowerby's Genera, re- 

 presents the O.volvain its adult state; and in Mawe's 

 Linn. pi. 2, f. 1, a matchless example of the O. volva, 

 (now in Mr. Broderip's cabiuet), is figured in. its young 

 state, before the formation of the inwardly reflected 

 hp. 



