I 12 



NEW YORK STATE MUSEUM 



Vertigo tridentata, 42". 



ventricosa, 43 1 . 

 Vitrea, 28 s . 



binneyana, 2Q a . 



cellaria, 28 5 . 



ferrea, 29 s . 



hammonis, 28 T . 



indentata, 29*, 29 7 . 

 Vitrina, 27 s . 



limpida, 27 s . 

 Vitrinidae, 27*. 

 Vivipara, 23*. 



contectoides, 23 s . 



Xolotrema appressa, 38*. 

 elevata, 38°. 

 palliata, 38 1 . 



Yoldia, 94 7 . 

 gouldi, 94 s . 

 limatula, 94 T . 

 sapotilla, 95 1 . 



Zirfaea, 64 7 . 



crispata, 64 T . 

 Zonites arborea, 30 4 . 



arboreus, 30 4 . 



chersina, 31*. 



Zonites fuliginosa, 27 s , 



fuliginosus, 28 1 . 



indentata, 29 T . 



indentatus, 29 s . 



inornata, 28*. 



inornatus, 28*. 



intertexta, 3i T . 



intertextus, 31 8 . 



ligerus, 31 9 . 



limatulus, 30 6 . 



minuscula, 30 8 . 



minusculus, 30 8 . 



multidentata, 32 s . 



multidentatus, 32 s . 



nitida, 29". 



nitidus, 29 s . 



suppressa, 32 1 . 



viridula, 29 1 . 



viridulus, 28 9 . 

 Zonitidae, 27 7 . 

 Zonitoides, 29 T . 



arboreus, 30 1 . 



exiguus, 30 9 . 



limatulus, 30 5 . 



milium, 31 1 . 



minusculus, 30 6 . 



nitidus, 29 7 . 

 Zoogenites harpa, 34 T . 

 Zua subcylindrica, 44*. 



