GLOSSARY. 



201 



TRACTILE, trak-til, capable of being 

 drawn out lengthwise. 



TRANSMITTED, transe-mitt-ed, sent 

 across or through ; as transmitted 

 light, that is, light which is made 

 to pass through anything. 



TRANSLUCENT, trans - loo - sent ; 

 TRANSLUCID, trans- loo-sid, trans- 

 parent, clear. 



TRANSVERSE, transe-verse, placed 

 in a cross direction. 



TRIDENS, try-dens, having three 

 teeth. 



TROPICAL, troppy-kal, belonging 

 to, or inhabiting regions near, or 

 within the tropics. 



TRUNCATE, trunk - ate j TRUN- 

 CATED, trunk-ate-ed, cut short off, 

 ending abruptly. 



TRUNCATULA, trunk-ate-youHah, 

 slightly truncate. 



TUBERCLE, tewber-kl, a small swell- 

 ing, a pimple. 



TUBERCULATE, tew-burk-you-late ; 

 TUBERCULATED, tew-burk-you- 

 late-ed, covered with small swell- 

 ings or pimples. 



TUMID, tew-mid, swollen. 



TuMiDULA,tew-midyoul-ah, slightly 

 swollen or tumid. 



TUMIDUS, tewmy-duss, swollen. 



TURRETED, tur-rit-ed, rising by 

 gradations, or step by step, like a 

 turret or small tower. 



TURTONI, tur-tow-ni, Turton's ; 

 named after Dr. Turton, a cele- 

 brated English Conchologist. 



TYPE, tipe, a mark, a model ; in 

 Natural History, the usual or com- 

 mon form or appearance of indivi- 

 duals of the same genus or species. 



TYPICAL, tippy - kal, figurative, 

 serving as a type or model. 



U. 



UMBILICAL, umbil-i-kal, belonging 



to the umbilicus. 

 UMBILICATA, umbil - i - kate - ah, 



having an umbilicus. 



UMBILICUS, umbil-ike-uss, literally, 

 the navel ; in Conchology, a hol- 

 low or perforation in the base of 

 the axis of some univalves ; some- 

 times it is very deep, extending 

 nearly to the apex and exposing 

 the interior of the spire j in some 

 cases it is shallow, and in others 

 consists of a mere chink. 



UMBO (plural UMBONES, um bo- 

 nees), a knob or boss ; in bivalve 

 shells the nucleus or prominent 

 part in each valve near the hinge, 

 answering to the apex in uni- 

 valves. 



UNCINI, un-si-ni, the teeth which 

 are situated on the lateral or side 

 areas (pleura) of the lingual rib- 

 bon. See LINGUAL RIBBON. 



UNDULATED, und-youll-ate-ed, 

 waved, curved in and out. 



UNGUIFORM, ungwy-form, shaped 

 like a finger-nail. 



UNICOLOR, you-nikko-lor, of one 

 colour. 



UNIO, youny-o, a pearl. 



UNIONID^, youny - o - nid - ee, a 

 family of freshwater molluscs. 



UNIVALVE, youny -valve, having 

 only one valve, or piece. 



V. 



VALVATA, val-vate-ah, valved 

 (having an operculum). 



VALVATID^E, val - vate - id - ee, a 

 family of freshwater molluscs. 



VALVE (Lat. valva), literally, one 

 of the leaves of a folding-door; 

 in Conchology, each part or piece 

 of a bivalve or multivalve shell ; 

 a univalve has only one piece or 

 valve. 



VARIETY, a term applied to indi- 

 viduals or groups of individuals 

 which differ distinctly but not 

 specifically from the type or 

 usual form of the species to which 

 they belong. 



