The Mammalia of the Vicinity of Cincinnati. 313 



Megalonyx, an extinct Sloth, and those of the Stag, Bison and Horse, 

 are also said to occur there. A large fragment of a Mastodon tooth, 

 found in the ashes of the ancient cemetery near Madisonville, Ohio, is 

 now in the collection of W. C. Rogers, Esq., of that place. Dr. Rufus 

 Haymond mentions the remains of three individualu, found near 

 Brookville, Indiana, two in drift gravel, the third in a piece of marshy 

 ground.* 



Order Rodentta : Bodents or Gnavjers. 



Family Castoroid^ : Giant Beavers. 



6. Castoroides ohioensis, Foster. — This, the largest of known 

 rodents, was described by J. W. Foster, in l'838,f from a lower jaw and 

 teeth found in digging the canal, near Nashport, Ohio ; its magnitude 

 may be inferred from the fact that the lower incisor measures eleven 

 and one-half inches in leno^th. 



'&" 



Summary. \ 



Existing . . 5 

 Orders represented . . \ Extirpated . . 1 



Extinct . . 1 



7 



Existino' . . 12 



Families represented , . \ Extirpated . . 5 



Extinct . . 4 



21 



Existing . . 29 

 Genera represented . . \ Extirpated . . 9 



Extinct . . 6 



44 



Existing . . 43 

 Species represented . . \ Extirpated . . 11 



Extinct . . 6 



60 



* Indiana Agricultural and Geological Reports, 1869, pp. 199-200 



T Vide- '•Second Annual Report on the Geological Survey of the State of Ohio." Colum- 

 bus, 1S3S, pp. 80-83. 



X Including list B, which contains 10 species not yet identified, but of probable occur- 

 rence here, five of which have been identified within the State ; and list C, of which four 

 species have not been identified in this vicinity. 



