CLAMS, OYSTERS, AND MUSSELS 123 



CLASSIFICATION OF THE EXAMPLES 



Branch X — MoUusca. 

 Class — Pelecypoda. 



Order — Pseudo-lamcllibrancliia. 

 Types of Order. 



Ostrca virginiana — Oyster. 

 Meleagri)ia margaritijera — Pearl oyster. 

 Order — Eulamellibranchia. 

 Types of Order. 



Vnio coiiiplanata — River mussel. 

 Mya arenaria — Long clam. 

 Vcn IIS incrccnaria — Quahog, or Round clam. 

 Class — CJasteroiJOtla. 

 Order — Pulmonata. 

 Types of Order. 



Physa species — Pond snail. 

 Limncea species — Pond snail. 

 Planorbis species — Porid snail. 

 Paludina species — Pond snail. 

 Helix albolahris — Land snail. 

 Limax flaviis — Slug. 

 Class — Cephalopoda. 

 Order — Decapoda. 

 Types of Order. 



Loligo peal a — Squid. 

 Sepia, officinalis — Cuttlefish. 

 Order — Octopoda. 

 Ty]3e of Order. 



Octopus vulgaris — Octopus. 



