— 13 — 



a. var. pavonia Lea. Hiver, rare. 



An. edentula, with its allied forms, such as the 

 following, is, I believe, at least as nearly related 

 with Margaritana, as with the typical Anodonta. 



136. Anodonta ferussaciana Lea. Ohio canal, scarce; 



river, a small, peculiar form. 



137. Anodonta corpulenta Lea. Clay pit pools near 



the tile factory. New Philadelphia; large, much in- 

 flated; one specimen is 1% inches long. 



138. Anodonta salmonea Lea. River and Ohio canal, 



common. 



139. Anodonta decora Lea. Little Stillwater creek, 



above Dennison. (Also in a ditch at Burton City, 

 Wayne Co., Ohio, Tuscarawas drainage.) 



140. Anodonta imbecillis Say. Scarce in the river; 



very common in the Ohio canal. Many specimens 

 have fine undulations in rows near the middle of 

 the valves. In very young specimens, the glochi- 

 dium shell is distinctly visible on the umbones. 



141. Sphaerium simile Say. Common in the clay pit 



pools near the tile factory; rare in the river. 



142. Sphaerium stamineum Conr. River, Ohio canal 



and mill races on them, very common; very vari- 

 able, especially as to striation. 



143. Sphaerium occidentale Prime. Rather common 



in pools and ditches; scarce in the river and canal. 

 A small, thin shelled form in a small pond near 

 Dennison. It has been found in large numbers, 

 living and propagating in low grounds of the Tus- 

 carawas valley, under wood, dead leaves, etc., 

 where water is standing only for a few days or 

 weeks in a year; a small form, with strong lines of 

 growth. 



144. Sphaerium trans versum Say. Rather common 



in the river and Ohio canal; young specimens are 

 found all the year round. 



145. Sphaerium partumeium Say. Common. It is 



noteworthy that almost every small pond, pool or 

 ditch, sojnetimes only a few rods distant from each 

 other, has its own, peculiar, rather constant form. 



