490 



GLOSSAEY. 



oysters, which have a shelly 

 covering, of which others are 

 destitute. 



TESTACELLA, a little shell. 



THERMAL, hot. 



THORACIC, belonging to the chest or 

 thorax. 



TORNATELLA, lat. t torno, to turn in a 

 lathe. 



TRACHYTE, a variety of lava com- 

 posed of feldspar, and often con- 

 taining crystals of glassy feldspar. 

 It frequently passes into other 

 varieties of igneous rock. 



TRAP, volcanic rocks composed of 

 feldspar, augite, and hornblende. 



TRAVERTINE, crystalline tufaceous 

 limestone. 



TRICUSPID, having three points. 



TRIDACNA, three bites. 



TRIDACTYLE, three-fingered. 



TRIGONIA, three corners. 



TRILOBATE, three-lobed. 



TRILOBITES, an extinct family of 

 Crustacea, having the back usually 

 divided into three lobes. 



TRITON, -a sea deity. 



TROCHUS, a child's top. 



TUBICINELLA, a little trumpet. 



TCFA, calcareous deposit from in- 

 crusting streams. 



TUFF, earthy volcanic rock. 



TURBINATED, top-shaped, in form of 

 an inverted cone. 



TURBINELLA, like a wreath. 



TURBO, lot., a wreath. 



TURRILITES, lot., turris, a tower. 



TURRITELLA, a little tower. 



U. 



UMBRELLA, a little shade. 



UNCONFORMABLE, strata lying in a dif- 

 ferent position from those on which 

 they rest, or which rest on them. 



UNGULATA, hoofed. 



UNGULINA, lat., ungula, a hoof. 



UNIO, a pearl. 



UNIVALVE, shell composed of but 

 one piece. 



Y. 



VALVATA, lot., valva, a folding-door. 



VEINS, fissures in rocks filled up 

 by extraneous substances, either 

 earthy or volcanic. 



VENERICARDIA, allied to Venus and 

 cardium. 



VERMES, worms. 



VERMETUS, lat., vermis, a worm. 



VERMIFORM, worm-shaped. 



VERMILIA, lat., vermis, a worm. 



VERTEBRATA, a great division of the 

 animal kingdom, all which are 

 furnished with a back-bone, as 

 mammalia, birds, reptiles, and 

 fishes, as distinguished from 

 mollusca, articulata, Crustacea, 

 zoophytes, and insects, which 

 have none. 



VERTICILLATE, arranged in whorls. 



VESICULAR, full of vesicles or cells. 



VILLI, processes in animal struc- 

 tures, resembling the pile of 

 velvet. 



VITRIFACTION, the fusion of a sub- 

 stance into glass by heat. 



VITRINA, lat., vitrum, glass. 



VIVIPAROUS, bringing forth live 

 young. 



VOLVARIA, lot., VOlvO, to roll. 



VOLUTA, a volute, or scroll. 

 VORTICIALIS, lot., vortex, a whirlpool. 

 VULSELLA, tweezers. 



Z. 



ZOOLITE, peculiar minerals found in 



volcanic rocks. 



ZOOLOGY, the study of animals. 

 ZOOLOGICAL, relating to animals. 

 ZOOPHYTES, animal vegetables ; a 



term incorrectly applied to corals 



and other animals, supposed to> 



resemble plants in form. 



