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Testaceous, consisting of car- 
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. 
Tuberculated, 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 shell. 
Varices, longitudinal ribs in uni- 
valve shells. 
Variety, difference in species. 
Vaulted, roofed. 
Ventral, belonging to the belly. 
CONCHOLOGY. 
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. 
W. 
Whorl, a spiral convolution. 
Z. 
Zigzag, having reverse turnings 
and windings. 
Zoned, surrounded by belts or 
girdles. 
