GLOSSARY. 375 
Tunicata, (Latin, tunica, u cloak.) A branch of animals covered 
with a leathery coat or case. 
Ungulata. (Latin, wxgula, a hoof.) The hoofed animals. 
Univalve. (Latin, ws, one; valve, folding-doors.) A shell com- 
posed of a single piece. 
Ventral. (Latin, venter, the stomach.) Belonging to the lower sur- 
face of the body. ; 
Ventricle. (Latin, venter.) One of the cavities of the heart that 
receives the blood from the auricle. , 
Vacuole, (Latin, vacuus, empty.) Cavities in the bodies of Proto- 
zoans. 
Viviparous. (Latin, vivus, alive ; and fario, I bring forth.) Applied 
to animals which produce their young alive, 
