THE NAUTILUS. XXVI. 



PLATE I 



1,2. POLYGYRA CLARKII BRADLEYI VAN. I VOL XXV p 120i 

 3.4. ALDRICH & PILSBRY : A NEW PLIOCENE NERITINA 

 5, 6. THYSANOPHORA COCKERELL/E PILSBRY 

 7. 8. HINKLEY: ON ANCULOSA. 

 9, 10. AMNICOLA WINKLEYI PILSBRY 

 11, 12. ASHMUNELLA FERRISSI PILS. ARIZONA. 



