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. 
{Bifidaria holzingeri (Sterki, Pupa). 
Cincinnati! (Billups); Troy! (Shepherd); Put-in Bay! 
(Walker); Kelley’s Island! (Allen). 
Bifidaria pentodon (Say, Vertigo), Pupa curvidens Gould, sPupa 
cincinnatiensis Judge. 
Over the state, common and variable. This species has been 
mistaken for and mixed up with B. tappanzana (‘‘ 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 Miller (nec Linné). 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. 
Vertigo morsei Sterki. 
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. 
{Vertigo ventricosa elatior Sterki. 
Summit Co.! (Pettingell); Stark and Tuscarawas Counties 
(St.). Probably over the state. (Has rather the sig- 
nificance of a species.) 
({)-Vertigo pygmza (Draparnaud, Pupa), callosa Sterki. * Pal. 
Columbus! (Hy. Moores a. os.). The most western station 
known. Rather different from European and North 
American pygm@a seen, and probably a variety, (but 
