EXPLANATION OF SCIENTIFIC TERMS. 



ACEPHALA. 



Adductors. 



Bivalve. 

 Brachiopoda. 



Branchiae. 

 Calcareous. 



Cephalopoda. 

 Cilia. 



CiRRHL 



Cirrhopoda. 



Dorsal. 

 Gasteropoda. 



LAMIJsiE. 



Mammalia. 



Ploadloss mollusks. 



Muscles by which the shells of mollusks are 



rapidly closed. 

 A shell, consisting of two parts or valves. 

 Mollusks, so called in allusion to two fleshy- 

 fringed anns, one on each side of the 

 mouth. 

 Gills, or aerating organs. 

 A substance is said to be calcareous when 



lime forms a principal component part. 

 Head-footed mollusks. 

 Filaments of a bristly or horny texture. 

 Jointed arms. 

 A class of mollusks, of which the barnacle is 



an example. 

 Belonging to the back. 

 Mollusks, having the under surface of the 



body formed as a foot. 

 Plural of lamina, a layer. 

 A class of animals which suckle their voung. 



