APPENDIX. 



325 



Fig. 1. — Upper Jaw, 

 Australian Dugong. 



Fig. 2.— Half of Upper Jaw, 

 Indian Dugong. 



One of the skulls of the Halicore australis, transmitted 

 by Mr. Jukes (fig. 1), which is of a size and age interme- 

 diate between the two skulls of Halicore indicus above 

 compared > has six alveoli (Z>, c, d, e,f, g,) on each side of 

 bothjaws, the last (g.) containing the germ of a molar, 

 which shews, at its widely open base, the great antero- 

 posterior extent, and the commencement of the lateral 

 longitudinal impressions, which produce, when the tooth 

 is worn, the hour-glass form of the grinding surface, cha- 

 racteristic of the last molar of the genus Halicore, 



The teeth, unfortunately, have been lost out of the five 

 anterior open sockets, the shape of which, however, shews 

 that all these teeth were of the simple sub-cylindrical form, 

 and had been in use, like the four teeth anterior to the last 

 molar tooth in the larger of the two skulls of the Halicore 

 indicus above compared. 



