GLOSSARY. IO9 



Truncate. Appearing as if abruptly cut off. 



Tubercle. A small wart or pimple. 



Turbinate. Top-shaped. 



Turgid. Full, as if swollen. 



Turreted. Extended to a long point. 



Umbilicus. The perforation in the pillar, at the base of the 



shell. It may be deep, narrow, wide, etc. 

 Umbo. Umbones. The protuberance seen on the valves of 



most bivalve shells, near the hinge. The part first formed. 



It presents various interesting characters. 

 Undulated. Waved. 

 Univalve. Composed of one valve, or piece. They are 



mostly spiral, sometimes conical, as in Ancylus. 

 Valve. Signifies one of the valves of a bivalve shell. The 



two valves constitute only one shell, 



Varices. Longitudinal ribs, crossing the whorls of univalves. 

 Venter. The belly. The right hand portion of the body 



whorl of univalves ; and the base, or lower edge of bivalves. 

 Ventricose. Inflated, bulged in the middle. 

 Verrucose. Warty. 

 Viscid. Glutinous. Ex., the slugs. 

 Whorl. One turn of a spiral shell. 



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