Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 AH have the aperture of the shell very narrow {fg. 66), a disposition approaching to the characteristic of the following tribe. 14. In the Tribe of Angiostoma, the aperture is generally so narrow that, to enter it, the foot of the animal is obliged to be doubled. In some, designated under the com- mon name of Volutes—Voluta—the aperture, which is of various forms, is terminated by a notch without a canal, and the columella is marked by oblique, projecting pl
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 AH have the aperture of the shell very narrow {fg. 66), a disposition approaching to the characteristic of the following tribe. 14. In the Tribe of Angiostoma, the aperture is generally so narrow that, to enter it, the foot of the animal is obliged to be doubled. In some, designated under the com- mon name of Volutes—Voluta—the aperture, which is of various forms, is terminated by a notch without a canal, and the columella is marked by oblique, projecting plicfe (folds), {fig. 67) : they are sub- divided into Volutes proper {fg. 56,page ), in which the aperture is wide, and the columella is marked by some large plicse, and the last whorl of the spire is sometimes ventricose, some- times conical; in the Mitra the spire is in general pointed and elongated, and in Oliva, so called from the oblong or ellipsoid form of the shell, the aperture is long, narrow, and notched opposite to the spire, and the columella is marked by numerous plicae {fig. 67). 16. In others the shell is oval, the spire is concealed, and the aperture, which is long and narrow, has no plicse on the side of the columella, but presents a notch or canal at its two extremities; these are the OvuL^ (fg. 68). Fig. 67. OLIVA.
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