490 



2790. The basal portion of a horizontally divided upper molar, in which the consti- 

 tuent plates are blended together by a common median tract of dentine, and 

 the enamel describes a continuous deeply-festooned line on each side. 



Hunterian. 



2791. The basal portion of a horizontally divided molar, showing a further stage of 

 formation, the constituent plates being more completely confluent, and the 

 enamel reduced to four insular strips, including as many masses of cement. 



Hunterian. 



Succession of the Molar Teeth in the Asiatic Elephant. 



2792. The maxillary and premaxillary bones of a very young Elephant, including 

 the first and second molars, and the sockets of the deciduous and permanent 

 tusks. 



The first molar consists of four principal plates, with accessory tubercles attached to the 

 first and fourth. The plates are blended together at their base, which is implanted by two 

 long divergent fangs. Eight plates of the second molar are developed, the first three of which 

 are blended together, and the first plate has a smaller accessory plate. 



Presented by Dr. Henderson. 



2793. A mutilated cranium of a young Elephant, in which the second molar has 

 come into use, and the first molar appears to have been shed. 



The first four plates, with the anterior accessory plate of the second molar, have come into 

 use, and all the plates have become confluent and are supported by two fangs. The deci- 

 duous tusks are shed ; the remains of their sockets may be seen external to those containing 

 the apices of the permanent tusks. 



Hunterian. 



2794. A mutilated cranium of a more advanced young Elephant. 



The sockets of the deciduous tusks and first molars are obliterated, the second molars are 

 reduced to the common dentinal base of the three posterior plates, and the first seven plates 

 of the third molar have come into use. This molar consists of thirteen plates : some of the 

 detached plates of the succeeding molar are exposed in its formative alveolus. 



Hunterian. 



2795. The nine anterior plates of the third molar, left side, upper jaw: the bases of 

 the first three plates have coalesced. Hunterian. 



