THE NAUTILUS. 



21 



Mahoning River, Cuyahoga River, Tuscarawas River. 



Anodonta. 



decora Lea, plana Lea? 



subcylindracea Lea, subcylindracea Lea, subcylindracea Lea. 



edentula Lea, edentula Lea, edentula Lea. 



imbicilis Say (very ? ? 



rare), 

 pavonia Lea, Var. pavonia Lea (typical) pavouia Yar. 



Above the falls. 



Margaratana. 



complanata Lea, 



Hildrethiaua Lea, 



(rare) 

 margin ata Say, 

 ruofosa Barnes. 



complanata Lea, 

 (canal) 



margin ata Say, 

 rugosa Barnes, 



JJnio. 

 alatus Lea, 

 circulus? Lea, 



circulus Lea, 



clavus Lam (common), 



coccineus Lea, coccineus Lea, 



cylindricus Say, 



fabalis Lea, 



gibbosus Barnes, 

 iris (rare). 



deltoidea Lea. 

 complanata Lea. 

 dehiscens Lea (rare). 

 Hildrethiana Lea 



(rare). 

 marginata Say ? 

 rugosa Barnes. 



alatus? Lea. 

 circulus Lea. 

 clavus Lam (rare), 

 coccineus Lea. 

 cylindricus Say. 



gibbosus Barnes, 



luteolus Lam. 



Novseeboraci Lea, 

 luteolus Lam., 



gibbosus Barnes. 



? ? 



irroratus Lea. 

 Novieeboraci Lea. 

 luteolus Lam (rare). 



multiradiatus Lea, raultiradiatus Lea, 



nasutus Say, 



occidens Lea, occidens Lea (rare), 



(subovatus) 



parvus (reservoirs) parvus (reservoirs) 



Barnes, 



phaseolus Hild., 



occidens (common) 



? ? 

 perplexus Lea (rare). 



? 9 



