178 



Sub-ronic, somewliat coiiicaL 



Sub-diaphanous, somewhat transpar- 

 ent or clear. 



Subrotund, nearly globular. 



Subulate, awl-shaped. 



Sulcated, furrowed. 



Suii'i, furrows or ridges. 



Summit, the tip or apex. 



Suture, a hollow line of division in 

 univalve shells, the spiral line of 

 which separates the wreaths. 



Tentaciila, the feelers of snails, which 

 inhabit shells. 



Tesselated, chequered like a chess 

 board. 



Testacea, the third order of worms, 

 including those which are covered 

 with a testaceous shell. 



Testaceous, consisting of carbonate of 

 Jime and animal matter. 



Tetragonal, four cornered. 



Torose, swelling into knobs or protu- 

 berances. 



Tortuosity, wreath, fiexure. 



Tortuous, twisted, wreathed, winding. 



Transverse, placed across, or cross- 

 ways. When the breadth of a shell 

 is greater than its length, it is called 

 transverse. 



Trapeziform, shaped like a trepeziura. 



Trigonal, having three angles. 



Truncated, stunted, cut short or ab- 

 ruptly oif at the end. 



Tubercle, a little knot or pimple. 



Tuberculated, knotted, pimpled. 



Tuberosities, prominent knots or ex- 

 crescences. 



Tubular, iu the shape of a hollow 

 tube. 



Tubulate, tubulous or hollow. 



Tunicated, coated. 



Turbinated, shaped like a top or pear. 



Turgid, swollen. 



U & V. 



Valve, the whole of univalve shells, or 

 shells in one piece ; and the half of 

 bivalves, or shells ia two divisions, 

 tScc. 



Varices, longitudinal ribs ia univalve 



shells. 

 Variety, is when one species differs 



some little degree from that of an- 



other. 

 Vaulted, like the roof of one's mouth. 

 Venter, the belly, situated in the body 



of the shell; being the most promi- 

 nent part, when the aperture is 



turned to the observer. 

 Ventral, belonging to the belly. 

 Ventricose, inflated, swelled 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 genua 



Bulla it is used for the apex. 

 Verrucose, warted. 

 Verticulated, whorled. 

 Umbilicated, having a depression in 



tlie centre like a uHvel. 

 Umbo, in bivalve shells, the round part 



which turns over the hinge. 

 Umbonate, bossed, having a raised 



knob in the centre. 

 Undulated, waved, having a waved 



surface. 

 Ungulate, shaped like a horse's hoof. 

 Unilocular, with 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 spatulated mark in several 



bivalve shells; foruied when the 



valves are united ou the posterior 



and anterior slopes. 



W. 



Whorl, one of the wreaths or turnings 

 of the spire of univalves. 



Z. 



Zigzag, having contrary turnings and 



windings. 

 Zoned, surrounded with one or moro 



girdles. 



