GLOSSARY. 113 



T. 



tenellus, tender. 



tentaculdta, furnished with tentacles. 



tennis, thin, slender. 



terrestrial, inhabiting the land. 



Testacetta, a small shell ; the name of a genus. 



TestacellidcB. A Family of mollusks. 



testaceous, having a hard shell. 



tincta, djed. 



tridens, furnished with three teeth. 



truncate, cut short, ending abruptly. 



truncdtula, slightly truncate. 



tuberculate, furnished with pimples. 



tumidus, swollen. 



Turtoni, named after Dr. Turton. 



type, a standard. 



typical, resembling the type. 



Z7. 



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. 



Vnio, a pearl ; the name of a genus. 



Unionidce. A Family of mollusks. 



univalve, (a shell) consisting of one piece. 



