OF CONCHOLOGY. 167 



little from another that it cannot be 



called a distinct species. 

 Vaulted, like the roof of one's mouth. 

 Venter, the belly, situated in the body 



of the shell; being the most promi- 

 nent part, when the aperture is 



turned to the observer. 

 Ventricose, inflated, swelling in the 



middle. 

 Vertex, in the Patella the top or most 



prominent part, situated in general 



nearly in the middle. In the Bulla 



it is used fjr the apex. 

 Verrucose, warted. 

 Verticulated, whirled. 

 Umbilicated, having a depression in 



the centre like a navel. 

 Umbo, in bivalve shells, the round 



part which turns over the hinge. 

 Umbonate, bossed, having a raised 



knob in the centre. 

 Undulated, waved, having a waved 



surface. 

 Ungulate, shaped like a horse's hoof. 



