"Volvaria is a cylindrical shell, convolute, the spire nearly hidden; the aperture straight, as long as the shell. There is a fossil species found in London clay. V. monilis is sometimes strung for necklaces. It comes from Senegal.
OVULA.
"The last family of the order Trachelipoda is Convoluta, which contains many very fine genera.
"They are the following:
| Ovula | Bulla. |
| Cypræa | The same. |
| Terebellum | Bulla. |
| Ancillaria. | |
| Oliva | Voluta. |
| Conus | The same. |
"The general characters of this family are the following:
"Shell without a canal, the base of the aperture sloping, or effuse, the spire compressed, the last volution almost covering the rest.
"Ovula, you will recollect, was formerly confounded with the Bulla genus: the form is egg-shaped, the outer lip toothed in one division, smooth in the other; the shells are white and polished, particularly O. oviformis, the poached-egg, from the Moluccas.
"O. volva, the weaver's-shuttle, is a rare and highly-valued species. It is nearly globular in the middle, and is terminated at each extremity by a long beak: it comes from the West Indies. O. gibbosa is a common species; the shape is oblong, with a ridge in the centre.