MANUAL 



OF 



ONCHOLOGY; 



STRUCTURAL AND SYSTEMATIC. 



WITH ILLUSTRATION* OF THE SPECIES. 



B Y GEORGE W/TR YON J JR. 

 v j 



CONSERVATOR OF THE CONCHOLOGHCAL SECTION OF THE ACADEMY OF NATURAL 

 SCIENCES OF PHILADELPHIA. 



VOL. I. 



CEPHALOPODA. 





PHILADELPHIA: 

 Published, by the Author 



ACADEMY OF NATURAL SCIENCES, COR. I9TH & RACE STS. 



1879. 



