OLOSSAliY. 



695 



Umbo (Lat. the boss of a shield). 

 The beak of a Lamellibranehiatc 

 shell. 



TTngulata (Lat. ungula, a hoof). 

 The order of hoofed mammals. 



URODELA(Gr.o»)V(, tall ; (tetos, visi- 

 ble). The tailed Batrachians. 



Vacuole (Lat. vacims, empty). 

 The little cavities in the bodies 

 of Protozoa. 



Ventral. Applied to the under 

 side of the abdomen, or of the 

 body of invertebrates. 



Ventricle (Lat. mntriculus, 

 diminutive of venter, belly). One 

 of the cavities of the heart. 



Verrictjlate. With thick - set 

 tufts of parallel hairs. 



VERRtjcosE. Covered vrith wart- 

 like prominences. 



Vertebra (Lat. verto, I turn). 



One of the bones of the spinal 

 column or backbone. 



Veeticillate. Placed in whirls. 



Vesicle (Lat. vesica, a bladder). 

 A little sac, bladder, or cyst. 



Viscera (Lat. viscus). The inter- 

 nal organs of the body. 



Viviparous (Lat. minis, alive ; and 

 pario, I bring forth). Applied to 

 animals which bring forth their 

 young alive. 



ZoOiD (Gr. zoon, animal ; eidos, 

 form). The highly specialized 

 organs of such animals as the 

 Hydroids, and other compound 

 forms which have a marked in- 

 dividuality, and which might be 

 mistaken for genuine individu- 

 als. 



Zoophyte (Gr. zo'on, animal ; phu- 

 ton, plant). Applied to the 

 plant-like polyps, sertularians, 

 and sponges. 



