Feb., 1847.] 



153 



nearly parallel, and inserted obliquely backwards; in the right 

 maxilla are the alveolre for eight teeth with double roots. In the 

 solidity of the teeth and slight divergency of the roots, this speci- 

 men agrees with the figures of Dr. Harlan and Prof. Emmons. 



This fossil is particularly interesting, as it removes every doubt, 

 if any remain, of the true character of the animal to which it be- 

 longed. The double occipital condyle shows it to have been a 

 mammal, while the squamous sutures and a symmetrical form refer 

 it to the Cetaceae. 



Dimensions. Length 14 in.; greatest breadth 7 in.; height 5| 

 in.; length of enameled portion of tooth f in.; breadth f in. It was 

 evidently a young individual. 



Geological position. The teeth described by Dr. Gibbes were 

 found in the oldest of the calcareous beds of the Eocene of South 

 Carolina, which contain Card ita plan icosta and other well known 

 Eocene fossils, together with Grypliea mutabilis and Terebratula 

 harlani, which are also common to the cretaceous formation. And 

 the fossil just described was found in upper beds of the Eocene so 

 that the Zeuglodon must have existed through the whole of the 

 Eocene period; a period which, in South Carolina, was at least 

 sufficiently long for the deposition of three hundred feet of calca- 

 reous and sedimentary matter; a fact which was ascertained by 

 boring at Charleston. 



