MANUAL 



OF 



Structural and Systematic, 



WITH ILLUSTRATIONS OF THE SPECIES. 



/< 



By GEORGE W. TRYON, Jr, 



CONTINl'KD BV 



H. ^Y A. PILSBRY. 



V^ol. XI. 



TROCHID^, STOMATIID/E. rLEUROTOMARIID/E, HALIOTID^. 



PHILADELPHIA: 

 Published by the Conchological Section, 



ACADEMY OF NATURAL SCIENCES, COR. igTH AND RACK STS. 



1889. 



