122 THE ELEMENTS 



Fig. 12th. Chama Cor. 

 13th. Area Noae. 



PLATE VII. 



Fig. 14th. Ostrea Opercularis. 



15th. Anomia Undulata. 



16th. Mytilus Incurvatus. 



17th. Pinna Muricata. 



UNIVALVE SHELLS. 



Fig. 18th. Argonauta Argo * 

 19th. Nautilus Pompilius.* 



