THE NAUTILUS. 



VI 1 



Tasmanian land shells, Preliminary notes on 

 Tetraplodou Spix ..... 



Tulotoma in the Tennessee drainage 



Unio Pilsbryi Marsh. (PI. I, figs. 7, 8) . 



Unio muddle ...... 



IJnionidae ...... 



TJnionidae and Mutllidse, notes on the genera of 

 Vallonia americana Ancey 

 Vitrina limpida in Pennsylvania 

 Volutoderma Woolmani Whitf. n. sp. (PI. II, 

 Walton, Robert. (In memoriam) 

 Yoldia montereyensis Dall, n. sp. 

 Zonitidse, some notes on ... . 



Zonites suppressus ..... 



figs. 4 



,5) 



/ 1 



30 



130 



1 



9 



20 



30 



94 



47, 94 



37,51 



90 



29 



13 



14 



