C0NCH0L0G7.— GLOSSAE Y. 



113 



above, and pono, I place. Laid 

 one upon another ; lyiag above. 



Su'ture. — The seam, or fine spiral 

 Ihie wliich separates the vvliorls or 

 Vv^reaths. 



Sy'phon — From the Greek, siphon, 

 a tube. 



Tact. — The sense which gives the 

 perception of touching. Touch is 

 active ; tact passive. 



Tectibranchia'ta. — From tego, 1 

 cover, and branchia, gills. Name 

 of an order of gasteropods. 



Tegume'atarv. — Relating to the tegu- 

 ment or covering. 



Telli'na. — In the plural tellirKB. 

 From the Greek, telline, a species 

 of mussel. A genus of acephalous 

 mollusks. 



Ten'tacle.— A feeler. 



Tenta'cula. — The feelers of snails. 



Tenta'cular. — Belonging or relating 

 to tentacles. 



Tenta'culum. — Latin. A feeler. 



Tere'bra. — Latin. From terebro, I 

 bore. A genus of gasteropods. 



Terebra'tula. — Plural, terebratul<B. 

 A genus of acephalous mollusks 

 (pap 89). 



Tere'do. — Latin. A ship-worm. 



Tere'dines. — Plural of teredo. 



Terre'stria. — Latin. Terrestrial. 



Ter'tiary forma'tion, or strata. — A 

 series of sedimentary rocks which 

 lie above the primary and second- 

 ary strata, and distinguished from 

 them by their organic remains. 



Te'sselated. — Chequered like a 

 chess-board. 



Tessela'tus. — Latin. Tesselated. 



Testa'cea. — From the Latin, tesia, a 

 shell. An order of acephaia cover- 

 ed with a testaceous shell. 



Testa'ceous. — Consisting of carbo- 

 nate of lime and animal matter. 



Testace'lla. — A genus of snails 

 {page 39). 



Te'trabranch. — Having four bran- 

 chis. 



Tetrabranchia'ta. — From the Greek, 

 tetter es, four, and bragchia, gills. 

 Name of an order of gasteropods. 



Te'tragonal. — Four cornered. . 



rnoRA'cic. — Belonging to the thorax. 



Tho'rax. — Latin. The chest. 



Pransve'rse, •— • Placed crosswise. 

 10* 



When the breadth of a shell is 

 greater than its length, it is termed 

 transverse. 



Trape'ziform, — Shaped like a trape- 

 zium. 



Trida'cna. — A genus of the family 

 of Chama'cea. 



Trico'rxis. — From the Latin, tres^ 

 three, and cornu, horn. Three 

 horned. 



Trigo'nia. — From the Greek, trigo- 

 nos, three-cornered. A genus of 

 the family of Ostracea. 



Trigo'nal. — Three-cornered. 



Trito'nia. — A genus of gasteropods. 



Trocho'ides. — From the Greek, tro^ 

 choSy a wheel, and eidos, resem- 

 blance. Name of a family of gas- 

 teropods. 



Tro'chi. — Plural of trochus. 



Tro'chus (tro-kus). — A genus of gas- 

 teropods. 



Trunk.— The body. 



Truncate. — Stunted, cut short or 

 abruptly off at the end. 



Tu'bercle. — A little knot or pimple. 



Tube'rculated. — Knotted or pirn- 

 pled. 



Tubero'sities, — Prominent knobs or 

 excrescences. 



Tu'bular. — In shape of a hollow tube 



Tu'bulate. — Hollow. 



Tubulibranchia'ta. — From the Latin 

 tubus, tube, and branchia, gills. An 

 order of gasteropods which have 

 the branchiae lodged in a tube 

 (page 59). 



Tunica'ta. — Name of an order of 

 acephalous mollusks. 



Tu'nicate. — From the Latin, tunica^ 

 a tunic. Coated. 



Tur'binated. — Shaped like a top or 

 pear. 



Tu'rgid. — Swollen, 



Tu'rreted, — Resembling a tower 

 with turrets. 



Tu'rbo. — Latin. A whirling or twist- 

 ing. A tribe of gasteropods {page 

 47). 



Turrite'lla. — Latin. A turret. A 

 genus of gasteropods. * 



Umbili'cus. — The aperture or depres- 

 sion in the centre, round which the 

 shell is convoluted. 



Umbili'cated. — Having a depression 

 in the centre like an umbili'cus. 



