300 POPULAR CONCHOLOGY. 



Tentacula. Arms or feelers. 



Terebrating Testacea. Such as take up their habitations 



in other substances, as Pholas, &c. 

 Testaceous. Composed of the materials which constitute 



shell. 



Transverse. See Longitudinal. 

 Truncated. Cut short off, or ending abruptly. 

 Tuberculated. Covered with small protuberances. 

 Turbinate. Having the body of the shell large or swollen, 



and the spire comparatively short. 

 Turreted. Having the whorls gradually decreasing, so 



as to form a fine point at the apex. 



Umbilicus. A small hollow, or sometimes a deep hole, on 

 the side of the inner lip in spiral shells, formed by 

 the inner edges of the whorls not touching each 

 other : in some genera, as Scalaria and Solarium, it 

 is so deep as to extend to the apex of the shell ; in 

 others, as Trochus, it is small ; in Bulimus it becomes 

 nearly obsolete; and in Natica it is often entirely 

 concealed by the spreading of the inner lip. 



Varices. Longitudinal raised bands or ridges, which 

 occur at regular distances in some Univalves, as Mu- 

 rex, Triton, &c. They mark the progressive enlarge- 

 ment of the shell, being the remnants of former aper- 

 tures, beyond which the animal, when grown, forms 

 another aperture. 



The greater part of these explanations are taken from 

 Mr. Swainson's Malacology. 



THE END. 



London : 



Printed by A. Spottiswoode, 

 New- Street- Square. 



