MANUAL 



OF 



9M 



Structural and Systematic. 



WITH ILLUSTRATIONS OF THE SPECIES. 



By GEORGE W. TRYON, Jr. 



Conservator of the Coxcholoojical Section ov the Academv of Natural 

 Sciences of Philadelphia. 



VOL. I. 



CEPHALOPODA 



PHILADELPHIA: 

 P u b 1 i s li e cl by t li e Author 



Academy of Natural Sciences, Cor. 19th & Race Sts. 



18T9. 



