— 9 — 



91. Amnicola parva Lea. Ohio canal, not common. 



92. AMNicoiiA CINCINNATIENSIS Anth. Ohio canal, 



very rare. 



93. PoMATioPSis I.APIDARIA Say. Common in some 



places; Blicktown along the canal. It has hardly 

 ever been found in the water, and even in rather 

 dry places, crawling on the ground, on wood and 

 dead leaves. 



94. BiTHYNELLA OBTUSA Say. Ohio canal at Blake's 



Mills, rare. 



95. Pleurocera labiatum Lea. River, rare. 



96. GoNioBASis LivESCENS Mke., var. lithasioides 



Lea. River, very common. 



97. GoNiOBASis GRACILIOR Anth. var. . River, 



common; variable. 

 98..GONIOBASIS PULCHELLA Anth. River, not common; 



ressembles closely the younger examples of the 



preceding. 

 99. GONIOBASIS DEPYGis Say. Little Stillwater creek. 



100. Valvata tricarinata Say. Common everywhere, 

 a. f. BiCARiNATA, with the type. 



101. Unio ligamentinus Lam. Very common in the 



Tuscarawas river. A single specimen was found in 

 the canal. Variable in size, shape and color; with 

 and without green rays; the dry shells of a spec- 

 imen weigh 23 ounces. Young, with byssus 4—6 

 inches long, are found not very rarely, attached to 

 stones or dead shells. 



102. Unio rectus Lam. Not rare in the river; l?rge; in 



the young, the nacre is purple colored, in the adult, 

 white. U. rectus is not. incrusted, like the other 

 species, probably owing to a peculiar, strongly ad- 

 herent, waxlike, blakish coat on the epiconch. One 

 specimen, female, is 184 mill. long. 



103. Unio luteolus Lam. Common in the river and 



creeks; large and beautiful in the Ohio canal; a 

 coarse, short form, very much inflated and badly 

 eroded, in the Little Stillwater creek. Prefers still 

 water and muddy bottom. 



104. Unio subovatus Lea. Common in the river: vari- 



