162 



CONCHOLOGY. 



Testaceous, consisting of car- 

 bonate of lime and animal 

 matter. 



Tortuosity, flexure. 



Tortuous, twisted. 



Transverse, crossways. 



Trapeziform, shaped like a tra- 

 pezium. 



1'rigonel, having three angles. 



Truncated, cut short, ending 

 abruptly. 



Tubercle, knot or pimple. 



Tuberculated, knotted, pimpled. 



Tubular, in the shape of a hol- 

 low tube. 



Tunicated, coated. 



Turbinated, shape like a top or 

 pear. 



Turgid, swollen. 



Ventricose, inflated, swelled in 

 the middle. 



Vermiform, worm-shaped. 



Vertex, the top of a most pro- 

 minent part. 



Verrucose, warted. 



Verticulated, whorled 



Umbilicated, having a depres- 

 sion in the centre. 



Umbo, the round part which 

 turns over the hinge. 



Undulated, waved. 



Ungulata, shaped like a horse's 

 hoof. 



Unilocular, chambered singly. 



Univalve, shells of one valve 

 only. 



Volutions, the turnings of uni- 

 valves. 



UandV. W. 



Valves, the various pieces which Whorl, a spiral convolution. 



compose the shell. 

 Varices, longitudinal ribs in uni- Z. 



valve shells. j Zigzag, having reverse turnings 



Variety, difference in species. I and windings. 



Vaulted, roofed. ! Zoned, surrounded by belts or 



Ventral, belonging to the belly, i girdles. 



