GLOSSARY. ; 113 
e. 
tenéllus, tender. 
tentaculata, furnished with tentacles. 
ténuis, thin, slender. 
terréstrial, inhabiting the land. 
Testacélla, a small shell; the name of a genus. 
Testacellide. A Family of mollusks. 
testaceous, having a hard shell. 
tincta, dyed. 
tridens, furnished with three teeth. 
triumcate, cut short, ending abruptly. 
truncatula, slightly truncate. 
tubérculate, farnished with pimples. 
tumidus, swollen. 
Tivrtoni, named after Dr. Turton. 
type, a standard. 
typical, resembling the type. 
U. 
umbilicata, having an umbilicus. 
umbilicus, the navel; applied to univalve shells, the cavity 
formed by the whorls when they do not form a solid 
axis or columella. 
umbo, the knob in the centre of a shield; applied to 
bivalve shells, the umbones (or beaks) are the pro- 
tuberances by the hinge which constituted the infant 
shell. 
unicolor, of one colour. 
Unio, a pearl; the name of a genus. 
Unionide. A Family of mollusks. 
univalve, (a shell) consisting of one piece. 
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