166 THE ELEMENTS 



including those which are covered 

 with a testaceous shell. 



Tetragonal, four cornered. 



Torose, swelling into knobs or pro- 

 tuberances. 



Transverse, placed across, or cross- 

 ways. 



Truncated, stunted, cut short or ab- 

 ruptly off at the end. 



Tubercle, a little knot or pimple. 



Tubular, in the shape of a hollow 

 tube. 



Tunicated, coated. 



Turbinate, shaped like a top or pear^ 



Turgid, swollen. 



V. 



Valve, the whole of univalve shells, or 

 shells in one piece ; and the half 

 of bivalves, or shells in two divi- 

 sions, &c. 



Varices, sutures of the wreaths, trans- 

 verse and gibbous. 



Variety, is when a shell differs so 



