THE NAUTILUS, XXVI. 



PLATE I 





1.2. POLYGYRA CLARKII BRADLEYI VAN. (VOL. XXV, p. 120). 

 3.4. ALDRICH & PILSBRY: A NEW PLIOCENE NER1T1NA. 

 5.6. THYSANOPHORA COCKERELL/E PILSBRY. 

 7.8. HINKLEY: ON ANCULOSA. 

 9, 10. AMNICOLA WINKLEYI PILSBRY. 

 11, 12. ASHMUNELLA FERRISSI PILS. ARIZONA. 



