CASTOEID^!. 221 



Castoroides ohioensis, Foster 1 . 

 Hab. N.America. 



40341. Cast of the cranium and the right ramus of the mandihle. 

 The original is from the Pleistocene of Clyde, New York, 

 and is preserved in the Geneva College, New York. 



Purchased, 1869. 



GENUS non det. 

 Hab. England. 



27985. A lower cheek-tooth of a large Rodent ; from the Pleisto- 

 (Fig.) cene of Copford, Essex. This specimen is figured in the 

 Quart. Journ. Geol. Soc. vol. viii. p. 188 (1852), and is 

 there provisionally referred to Castor. The figure is re- 

 produced in the accompanying woodcut (fig. 30). The 



Fig. 30.' 



Lower cheek-tooth of a castoroid rodent ; from the Pleistocene of Copford. 

 \. (From the Geological Society's ' Journal.') 



tooth differs from the molars of all species of Castor known 

 to the writer, by the circumstance that the enamel-folds 

 run directly across the crown. It comes nearer to the 

 molars of Trogontherium, but does not seem to agree 

 exactly with any specimens available for comparison. 



Presented by John Brown, Esq., 1852. 



1 In Mather's Second Annual Report of the Geological Survey of the State 

 of Ohio, p. 81 (Columbus, 1838). 



