386 GLOSSARY. 



Villi. Small processes like the pile of velvet. 

 Vitelline. ( hat. vitellus, yolk.) Of or belonging to the yolk. 

 Viviparous. (Lat, vivus, alive; pario, I bring forth.) The animals which bring 

 forth their young alive. 



XiPHOsuRA. (Gr. xiphos, a sword; oura, a tail.) A family of Crustacea with 

 sword-shaped tails, as the Limulus. 



Zoophyte. (Gr. zoon, animal; phyton, plant.) The lowest primary division of 

 the Animal Kingdom, which includes many animals that are fixed to the ground, 

 and have the form of plants. 



