352 



TRANSACTIONS OF THE 



plays these portions: A, the palate bone; the thick- 

 ness of the side of the maxilla. 



The teeth present a remarkable structarcj and as far 

 as my observations go are peculiar to the present species: 

 of the four remaining teeth in this jaw no two resemble 

 each other. The first in the existing series, or third 

 from the anterior portion of the jaw, is conical in form, 

 and was covered with a thin layer of enamel, presenting 

 a crenulated surface, a small portion of which still ad- 

 heres on the anterior portion of the crown; pi. 22, fig. 1, 

 e. Fig. 4 is a view of an isolated molar. All the teeth ap- 

 pear to have been similarly enveloped in enamel : the roots 

 are also remarkable both in length, form and curvature, 

 descending 2| inches into the socket, and projecting 1 

 inch above the alveoles before they are united by the 

 body of the tooth. PI. 22, fig. 1,/. This is also a double 

 tooth, yet totally dissimilar in form to the last; the outer 

 surface is fractured, but the posterior part of the crown 

 retains its natural form. Not the least appearance of 

 enamel is observed passing into the body of the tooth : 

 that it was covered with enamel is evident from the ex- 

 amination of a similar isolated tooth from the opposite 

 jaw, in a better state of preservation, and the crown of 

 which being weather-worn, enables us to present an out- 

 line of the enamel near the crown of the tooth ; pt. 22, 

 fig. 2. The whole tooth, is also represented at fig. 3. 

 Posteriorly to this double tooth, in pi. 22, occur two sin- 

 gle teeth with each one separate root; their original con- 

 tour, especially towards their crowns, has been destroyed 

 by fracture. 



Anteriorly to the first or conical double tooth, the 

 fossil jaw has been fractured traversely; it contains the 

 socket for one double molar; pi. 22, h and c; and 

 another anterior or canine tooth of considerable com- 

 parative size ; pi. 22, a. Directly above this tooth, 

 imbedded in the limestone w^hich encloses the inner por- 



