PROC. ACAD. NAT. SCI. PHILA. 189S. 



PLATE IX. 



7ft. 



.vrii. 





<Miu&imm 



2 



6 



13 



9 10 11 



8 



Pilsbrv and Van at t a del. 



PILSBRY AND VANATTA. NORTH AMERICAN SLUGS. 



