Catalogue of Land and Fresh Water Shells. 



91 



Genus Vallonia. 



20. Vallonia minuta, Say. 



Size of pin head, lipped, open umbilicus. Rocky places. 



21. Vallonia costata, Mull. 



Size of pin head, lipped, open umbilicus, ribbed. Rocky places. 



Genus Stenotrema. 



22. Stenotrema hirsuta, Say. 23, 24. 



Brown, hirsute, long tooth on parietal wall, notch on outer lip, 

 width less than half inch. Found everywhere. 



23. Stenotrema stenotrema, Fer. 



Like No. 22, but over twice as large. Woods. 



24. Stenotrema monodon, Rack. 



Similar to No. 22, but without notch in outer lip. Damp places. 



Genus Patula. 



25. Patula alternata, Say. 26. 



W. 1, No lip, beautifully marked with oblique rows of brown 

 blotches. Everywhere abundant. 



26. Patula solitaria, Say. 



W. i and over. Higher apex than No. 25, with regular longitu- 

 dinal brown stripes, 'lhickets. 



27. Patula perspectiva, Say. 



W. over widely open umbilicus. Under bark and logs. 



28. Patula striatella, Anih. 



W. less than umbilicus not so wide and not as brown as No. 

 27. Lumber yards near water. 



Genus Zonites (Monlf). 



Genus Hyalina (Gray). 



The distinction between the genus Zonites and the genus 

 Hyalina is not fully determined. Both genera have little or 

 no perceptible thickening of the lip, with a glossy epidermis. 



29. Zonites fuliginosus, Griff. 

 W. 1, dark. Woods. 



