495 



2823. A corresponding tooth, from the left side of the same lower jaw. 



Presented by Dr. Henderson. 



2824. The left ramus of the lower jaw, with the inner alveolar wall removed, to 

 expose the remains of the fifth molar, and the major part of the sixth molar 

 tooth. 



The fifth molar has been reduced to its last nine plates, which are supported upon a base 

 subdivided into many slender curved fangs. The sixth molar consists of eighteen plates, of 

 which the first four plates have come into use, and the last three are still detached. The 

 total length of this molar is 9 inches. The dental canal expands into a sinus, which sepa- 

 rates the thin and smooth proper wall of the alveolus from the outer plate, or thick proper 

 wall of the ramus of the jaw. The hindmost part of the proper wall of the socket is com- 

 pressed and produced backwards, but is not perforated, nor shows any indication of the begin- 

 ning of a succeeding socket. The length of the ramus is 21^ inches. 



Presented by Dr. Henderson. 



2825. The sixth, and probably last, molar tooth, left side, lower jaw. 



It consists of eighteen plates, but the worn anterior end may have been the common den- 

 tinal base of two or three other plates. Long and separate roots have been developed from 

 the anterior half of this tooth. Its total length is 12 inches ; its greatest depth is 7 inches. 



Hunterian. 



2826. The germ of the sixth molar tooth, left side, lower jaw. 



It consists of nineteen plates, of which the first five are confluent at their bases. 



Presented by Dr. Henderson. 



2827. The germ of the sixth molar tooth, right side, of the same lower jaw. 



It consists of twenty-one plates. 



Presented by Dr. Henderson. 



Miscellaneous Molars of the Asiatic Elephant. 



2828. A portion of the last molar tooth, right side, lower jaw. 



It includes eleven of the constituent plates, of which the first five have begun to be worn, 

 but the root is not developed beneath these. 



Presented by Dr. Henderson. 



2829. A portion of the last molar tooth, left side, lower jaw. 



It includes eleven plates, all of which have been in use. 



Hunterian. 



