MOLLUSCA OF OHIO. 379 



Bifidaria armifera (Say, Pupa). 



Over the state, common; oftener found at dry places than 

 any other species. 

 Bifidaria contracta (Say, Pupa). 



Over the state, common. 

 jBifidaria holzingeri (Sterki, Pupa). X 



Cincinnati! (Billups) ; Troy! (Shepherd); Put-in Bay! 

 (Walker); Kelley's Island"! (Allen). 

 Bifidaria pentodon (Say, Vertigo), Pupa curvidens Gould, Pupa 

 cincinnatiensis Judge. 

 Over the state, common and variable. This species has been 

 mistaken for and mixed up with B. tappaniana ("pent- 

 odon"), later known as curvidens Gould, recently 

 changed to pentodon, by Vanatta and Pilsbry. 

 Bifidaria pentodon gracilis Sterki. 



New Philadelphia (St.). This form is widely distributed 

 outside of Ohio, e. g. in Alabama, and has been regarded 

 as a species by some conchologists. 

 Bifidaria tappaniana (Adams, Pupa). 



Over the state, common. The form curta Sterki at wet 

 places. This has been known as Pupa and Bifidaria 

 pentodon Say; the name was recently changed to the 

 above, by Vanatta and Pilsbry. 

 Bifidaria corticaria (Say, Odostomia, Pupa). 



Over the state. 

 Pupa (Pupilla) muscorum M tiller (nee Linne). X 



Cited from Ohio (and no doubt to be found, being known 

 from New York, Michigan and Illinois). 

 Vertigo milium (Gould, Pupa). 



Over the state. 

 fVertigo morsei Sterki. X 



Castalia, Erie Co. (St.), and probably over the north-western 

 part of the state, being known from north-east Indiana, 

 and Michigan. 

 Vertigo ovata Say. 



Over the state, common and rather variable. 

 Vertigo ventricosa (Morse, Isthmia). 



Over the state. 

 t Vertigo ventricosa elatior Sterki. 



Summit Co.! (Pettingell) ; Stark and Tuscarawas Counties 

 (St.). Probably over the state. (Has rather the sig- 

 nificance of a species.) 

 (t) Vertigo pygmaea (Draparnaud, Pupa), callosa Sterki. X Pal. 

 Columbus! (Hy. Moores a. os.). The most western station 

 known. Rather different from European and North 

 American pygmcea seen, and probably a variety, (but 



