XXVI 
Explanation of Terms. 
Tubicolar. 
Inhabiting a tube. 
Univalve. 
With one shell or opening. 
Ventral. 
Belonging to the belly. 
Vertebrated. 
Having a jointed spine-bone. 
Viscera. 
The organs contained in the cavities of the body. 
Viviparous. 
Bringing forth the young alive. 
Webbed. 
Connected by a membrane, as the toes of aquatic 
birds. 
Xylophagous. 
Wood-eating. 
Zoologists. 
Writers on animated nature. 
Zoology. 
The history of animated nature. 
