GLOSSARY. 



227 



Tetrajifonal, four coniercd. 



Torose, swelling into knobs or pro- 

 tuberances. 



Tortuosity, wreath, flexure. 



Tortuous, twisted, wi'eathed, A^ind- 

 ing. 



Transverse, placed across, or cross- 

 ways. Wlien the breadth of a 

 shell is greater than its length, 

 it is called transverse. 



Trapeziform, shaped like a tra- 

 pez'.iim. 



Tritjonal, having three angles. 



Truncated, stunted, cut short or 

 abruptly off" at the end. 



Tubercle, a little knot or pimple. 



TubercuJated, knotted, pimpled. 



Tuberosities, prominent knots or 

 excrescences. 



Tubicolar, inhabiting a tube. 



Tubulai", in the shape of a hollow 

 tube. 



Tubulate, tubulous or hollow. 



Tunicated, coated. 



Turbinated, shaped like a top or 

 pear. 



Tura;id, swollen. 



U & V. 



Valve, a distinct piece or part ; the 

 whole of univalve shells, or shells 

 in one piece ; and the half of bi- 

 valves, or shells in two divisions, 

 &c. 



Varices, longitudinal thick ribs in 

 univalve .shells. 



Variety, is when one species differs 

 some little degree n-om that of 

 another. 



Vaulted, arched, like the roof of 

 one's mouth. 



Venter, the belly, situated in the 

 body of the shell ; being the most 

 prominent part, when the aper- 

 ture is turnetl to the observer. 



Ventral, belonging to the belly. 



Venti'icose, inflated, swollen in the 



middle. 

 Vermiform, worm-shaped. 

 Vertex, in the Patella the top or 



most prominent part, situated in 



general nearly in the middle. In 



the genus Bulla it is used for the 



apex. 

 Verrucose, warty. 

 Verticillate, wliorled. 

 Umbilicated, having a depression 



in the centre hke a navel. 

 Umbo, in bivalve shells, the pi'omi- 



nent part which tui'us over tlio 



hinge. 

 Umbonate, bossed, having a raised 



knob in the centre. 

 Undulated, v.aved, ha\'ing a waved 



surface. 

 Ungulate, shaped like a horse's 



hoof. 

 Unilocular, Avith a single chamber 



or compartment. 

 Univalve, shells consisting of one 



valve, or piece. 

 Volutions, the wreaths, or turnings 



of the shells of univalves. 

 Urceolate, swelling in the middle 



like a pitcher. 

 Vulva, a mark in several bivalve 



sliells ; formed when the valves 



are united on the posterior and 



anterior slopes. 



W. 



"Whorl, one of tlie wreaths or turn- 

 ings of the spire of univalves. 



Zigzag, having contrary turnings 



and windings. 

 Zoned, surrounded with one or 



more girdles. 



