Proceedings U. S. National Museum, Vol. XI, 1888.— Sterki. 



Plate XLII. 



/ /«'■ 



^Callus. 



Diagrams Exhibiting the Arrangement and Relation of the Teeth in Vertigo 



Fig 1. Vertigo antiveriigo Drap. 

 Fig. 0. F. pentodon Say. 

 Fig. 3. V. gouldii Binney. 

 Fig. 4. P. tridentata Wolf. 



Figs. 5-7. V. ovata Say. 



Figs. 8,9. V. alpestris Alder. 



Figs HM3. Angustula milium troula. 



Figs. 11,12. Angustula vi netzit Charp- 



Explanation of plate on i>asvs 379-380.) 



