HALICORE. 147 



3. Skull, bisected, 12 inches long in straight line, over 



vertex 20 inches. Anterior nares 2| inches in 

 transverse, 4 A in sagittal diameter; premaxillaj slope 

 down 6^ inches from anterior nares to tip, and con- 

 tain left tusk ; for right, see No. 6. Mandible not so 

 large as in No. 1, and with four pairs of tooth sockets 

 in symphysis. Knox Collection, No. 108. 



4. Skull, immature. The supra-, ex-, and basi-occipital not 



fused with each other, and the last-named separate 

 from the sphenoid. Length of skull in straight line 

 12^ inches, 18i inches over vertex. Anterior nares 

 2| inches in transverse and 3| in sagittal diameter ; 

 premaxillary beak from anterior nares to tip 5f 

 inches. Mandible not so massive, length 8 inches, 

 height from condyl to angle 5 inches, length of 

 symphysis 3| inches, four pairs of tooth sockets. 

 Queensland. Donor— Sir Wyville Thomson. 



5. Skull, Cast of; right premaxillary beak cut to display" 



a large tusk in its socket. Anterior nares 3 inches 

 transverse diameter, 4| in sagittal. 



6. Tusk, outer half of right, from No. 3 ; 6^ inches long. 



It had been bisected and the pulp cavity, 2| inches 

 long, exposed. A mesial line extends through the sub- 

 stance of the tooth from the apex of the pulp cavity 

 to the free end of the tooth. 



Knox Collection, No. 109. 



As the skulls were of different ages, an opportunity 

 to stud}^ different stages of dentition was given. In 

 the youngest skull, No. 4, the symphysial part of 

 the Mandible had four wide, shallow sockets in which 

 there were no teeth. In the skull No. 3, the 

 corresponding sockets were wider and deeper ; each of 

 the third pair contained a rudimentary styloid tooth 

 thickened at its deep end, the others were empty. 

 In the skull of No. 2 the sockets were moderately 

 wide, deep, and empty. In No. 1, the oldest skull, 

 the sockets were empty, four large on the right side, 

 but on the left a small socket was interposed between 

 the large second and third, making five in all. The 

 molar teeth in the mandible were worn and flattened 

 on the surface of the crown. In the youngest skull, 

 No. 4, were six sockets with four teeth with flattened 

 crowns on each side. The anterior tooth was lost ; the 

 most posterior contained an unerupted tooth with a 



