VI THE NAUTILUS. 



Shells of Fresh Pond, Cambridge, Mass. . . . .24 



Showalter or Schowalter ...... 96, 108 



Sonorella betheli Henderson! n. sp. . . . . . 123 



Sonorella from the Grand Canyon, Arizona . . . 122 

 Sonorella, odorous . . . . . . . .135 



Spring collecting in Southwest Virginia ... 81, 91 

 Strophitus edentulus and undulatus . . . .23 



Succinea ovalis, reversed ....... 24 



Succinea nisei on Bobolinks ...... 72 



Swan Island, List of land shells from . . . .97 



Thracia conradi, Notes on 73 



Unio complanatus . . . . . . 23, 29 



Unio gibbosus 23, 29 



Unio of the Wabash and Maumee drainage . . .131 

 Unio (Nephronaias) ortmanni Frierson n. sp. (PI. II) . 14 

 Unio fauna of the great lakes . . . .18, 29, 40, 56 



Urocoptis (Arangia) sowerbyana a note on its radula . 11 

 Veronicella from Guatemala ...... 1 



Veronicella mexicana betheli Cocherell v. nov. . . 2 



Trochidse, A new genus of ...... 86 



Vetulonia Dall new genus. ...... 86 



Vetulonia galapagana Dall n. sp. . . . .87 



Vetulonia Jeffreys! Dall 87 



Wyoming shells ........ 37 



Zoological station, Naples . . . . . 4, 16 



