GLOSSARY. 



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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 tropic^. 



Truncate, trunk - ate ; Trun- 

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

 ending abruptly. 



Truncatula, trunk-ate-youl-lah, 

 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. 



TUMlDULA,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 modeJ. 



U. 



Umbilical, umbil-i-kal, belonging 



to the umbilicus. 

 Umbilicata, unibil - 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 ; 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 {pleiircs) 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. 



Un I color, 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^, val - vate - id - ee, a 

 family of freshwater molluscs. 



Valve (Lat. valva), literally, ore 

 of the leaves of a folding-door ; 

 in Conchology, each part or piece 

 of a bivalve or mullivalve shell ; 

 a tinivalve 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. 



