396 OHIO STATE ACADEMY OF SCIENCE. 
Musculium partumeium (Say, Cyclas), Spherium, Calyculina 
part. 
Over the state, in quiet waters; variable. 
A form: more rounded in outlines, more regularly 
inflated, with broad, low beaks, smaller than typical par- 
tumeta, seems to represent a variety. Garrettsville! (Stre- 
ator); New Philadelphia (St.); a simliar form from Mentor 
(Allen). 
+Musculium jayense (Prime, Cyclas), Spherium jayanum Prime, 
Mon. Corb. 
Cincinnati; probably over western Ohio. 
*Musculium truncatum (Linsley, Cyclas), Spherium, Caly- 
culina tr. 
Portage Co. (Streator, St.) ; Geauga and Cuyahoga Counties! 
(Allen) ; Stark and Tuscarawas Counties (St.); probably 
all over the state. 
Musculium securis (Prime, Cyclas), Spherium, Calyculina securts. 
Over the state, common in ponds, pools, ditches, variable. 
Seyeral forms seen are considerably different and may 
represent varieties or even distinct species. 
Musculium sphericum (Anthony, Cyclas), described from 
the Black River, Lorain Co., is beliveed to be a form of 
securis; I have seen no authentic specimens. 
*Musculium sp. — X 
Geauga Lake, east of Cleveland (Allen). [Quite distinct from 
all other species, and probably underscribed; the same 
has been seen from Michigan, Indiana and Illinois]. 
Pisidium virginicum (Gmelin, Tellina, Cyclas dubia Say. 
Cuyahoga River and Breakneck Creek, Portage Co., Nimi- 
shillen Creek, Stark Co.; Auglaize River (all: St.); 
Cincinnati. 
Pisidium compressum Prime. (The “river form,’ regarded 
as typical). 
Over the state, common in rivers and creeks, rarely in 
springs. 
Pisidium compressum levigatum Sterk1. 
Springfield Lake, Meyer’s Lake (St.); in quiet waters. 
Pisidum compressum opacum Sterk1. 
Sloughs on the Tuscarawas River (St.). 
+Pisidium kirklandi Sterki. 
Auglaize River at Wapakoneta (St.). 
*Pisidium cruciatum Sterki. 
Tuscarawas River, Miami Canal at Hamilton (St.). 
+Pisidium fallax Sterki. 
Rivers, creeks and races in Portage, Summit, Stark and 
Tuscarawas Counties; Miami Canal at Hamilton; San- 
dusky and Maumee Rivers (all: St.). 
