GLOSSARY. XV 



lated^ when the tooth is received into a eorres])onding 

 cavity in the opposite vahe : cardinal^ tlie central tootli or 

 teeth of the hinge : compressedy when flattened : erects 

 perpendicular to the plane of the hinge : yor^erf, hav- 

 ing the point divided into two: lonf/itiulinal, when it 

 extends along the margin. 



Tubercle^ a protuberance or knob. 



TubulaVf (applied to Multivalves), when the greatest 

 part of the shell is cylindrical. 



Turbinated, when the belly of the shell is large in pro- 

 "" portion to the spire, which seems to proceed from the 

 <:entre. 



ValveSf the different pieces which compose the shell. 



Ventricose, bellied. 



Vermiforniy having the form of worms. 



Vertexj the top or point of a shell. 



Umbilicated, having a hole in the base of the pillar, 

 Umboy the summit. 

 Undulatedy waved. 



Whorly a spiral convolution. 



