139 



580. An upper molar of the Mammoth, from which some of the anterior 

 plates have heen detached by decomposition ; these exhibit the three 

 vertical lines from which the dentinal tubes radiate. 



From the pleistocene beds forming the brick-earth of Grays, in Essex. 



Mus. Parkinsojt. 



581. A fragment of one of the upper molars of the Mammoth. 



Locality unrecorded. Hunterian. 



582. A portion of the anterior part of the molar of a Mammoth, with the base 



of the fangs. A great part of both the dentine and cement of the crown 

 has been decomposed and removed, leaving the longitudinally plicated 

 laminae of the enamel. 



Locality unrecorded. Hunterian. 



Growth and Succession. 



583. A fragment of the left superior maxillary bone of a young Mammoth, 



including a small anterior molar, the second in the order of development, 

 and part of the socket of the third molar. The grinding surface of the 

 molar exhibits seven transverse plates, the first two being worn down to 

 their common connecting base, and the last having the summits of 

 four mammillary divisions abraded. 



From the drift or pleistocene beds at Ilford, in Essex. 



Presented by John Gibson, Esq., F. G. S. 



584. An upper molar of a young Mammoth ; the crown is divided into eight 



plates, five of which have come into use ; the length of the crown is 

 three inches, its breadth one inch and a half ; the three posterior plates 

 have become detached. 



By analogy with the Indian Elephant, this molar, like the preceding, 

 must be the second in order of succession. 



Locality unrecorded. Hunterian. 



585. An upper molar of a young Mammoth, which had come into use a short 

 period before death. In the abraded portion of the crown, which mea- 

 sures one inch and a half in length, the summits of six transverse ridges 



t 2 



