151 



which is seven inches and a half in length. Two small fangs are 

 developed from the anterior extremity of the tooth : the common pulp 

 cavity of the ten posterior plates is widely open. 



From the tertiary deposits on the banks of the Ohio, North America. 



Hunterian. 



616. The upper molar of a Mammoth. The grinding surface, which is nine 

 inches in length, exhibits seventeen lamellae, the dentinal plates having 

 on one side been abraded to their common connecting base : the re- 

 flexion of the enamel is shown round the bottom of the entering fissure, 

 and it presents accordingly the undulating or Daedalian disposition 

 noticed in Nos. 612 and 613. 



From the drift or pleistocene at Wellsbourn. Mus. Parkinson. 



617- A lower molar of a Mammoth. The grinding surface, which is four 

 inches and a half in length, presents eleven plates ; the interspaces 

 containing the cement being broader than the plates of dentine and 

 enamel, which are very slightly dilated in the middle. The coronal 

 plates are worn down to near their common base, and a long fang has 

 been developed from this part of the tooth. 



From the tertiary deposits of the banks of the Ohio, North America. 



Purchased. 



618. A lower molar of a Mammoth. The crown is more abraded than in the 

 preceding specimen, and the grinding surface in a longitudinal extent of 

 four inches displays the summits of eight transverse plates. 



From the tertiary deposits of the Ohio, North America. 



Purchased, 



619. The upper molar, wanting one or two of the anterior plates, of a Mam- 

 moth from Siberia. The abraded summit of this tooth is six inches long, 

 and presents eleven transverse plates ; they are thicker than in the Ame- 

 rican Mammoth, and are relatively fewer in number ; but, in proportion 

 to their breadth, they are thinner than in the Asiatic Elephant, and are 

 closer together ; there is consequently a less proportion of cement in 

 the grinding surface of the crown, and a greater proportion of dentine and 



