EXPLANATION OF SCIENTIFIC TERMS. 



MOLLUSK. 



multivalve. 



Operculum. 



Ovipositor. 



Palliobranchiata. 



PeDUNX'LE. 



Pterofoda. 



Serrated. 



Tentacula. 



Univalve. 



A soft-bodied animal, as a snail, or an oyster. 

 Plural, mollusca. 



A shell consisting of several pieces. 



Lid of a shell. 



The instrument by which the eggs are con- 

 ducted to their appropriate place. 



Animals which breathe by means of the 

 mantle. 



A fleshy substance or foot-stalk, by which 

 animals fix themselves to various bodies. 



Wing-footed mollusks. 



Like the teeth of a saw. 



Parts of an animal acting Uke the horns of 

 a snail ; arms by which prey is seized. 

 Plural, tentacula. 



A shell complete in one piece. 



