152 



CONCHOLOGY. 



bonate of lime and animal 

 matter. 



Tortuosity, flexure. 



Tortuous, twisted. 



Transverse, crossways. 



Trapeziform, shaped like a tra- 

 pezium. 



Trigonel, having three angles. 



Truncated, cut short, ending 

 abruptly. 



Tubercle, knot or pimple. 



Tuberculaicd, knotted, pimpled. 



Tubular, in the shape of a hol- 

 low tube. 



Tunicated, coated. 



Turbinated, shape like a top or 

 pear. 



Turgid, swollen. 



U and V. 



Valves, the various pieces which 

 compose the she!!. 



Varices, longitudinal ribs in uni- 

 valve shells. 



Variety, difference in species. 



Vaulted, roofed. 



Ventral, belonging to the belly. 



! Ventricose, inflated, swelled in 

 the middle. 



Vermiform, worm shaped. 



Vertex, the- top or 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. 



Ungulate, shaped like a horse's 

 hoof. 



Unilocular, chambered singly. 



Univalve, shells of one valve 

 only. 



Volutions, the turnings of uni- 

 valves. 



W. 



Whorl, a spiral convolution. 



Z. 



Zigzag, having reverse turnings 



and windings. 

 Zoned, surrounded by belts or 

 girdles. 



THE END. 



