98 SPECIMENS OF CETACEA. 



Ill this specimen tlie superior maxilla is 8^ inches 

 long; each contains a non-protruded tusk, behind 

 which is an aborted tooth | inch long and y\ inch 

 wide enclosed in a distinct sac. Described by Turner, 

 Froc. Roy. Soc. Edin., vol. ix. p. 110. Also in vol. vii. 

 p. 760, a description is given of a foetus 7^ inches 

 long, with two dental papillae imbedded in the gum, 

 one in front of the other. The figure below, of a 

 longitudinal section through the gum, magnified, 

 shows their relative position. 



7. Skull of fcetus, disarticulated ; the socket of each superior 



maxilla contains a concealed tusk ; a little further 

 back is a second socket, in which a corresponding 

 tooth is not present. Turner Collection. 



8. Vomer, spout-like, with mesethmoid cartilage occupying 



the interval between the two lateral halves and 

 extending for 3 inches in front of the tij) of the bone ; 

 from the foetal skull No. 6. Turner Collection. 



9. Mandible without skull. No teeth or alveoli. 



Goodsir Collection. 



10. Tusk, 6 feet 10 inches long ; spiral surface pronounced. 



Donor — Sir Douglas Maclagan. 



11. Tusk, 6 feet 9| inches long; spiral arrangement pro- 



nounced. Donor — Sir Douglas Maclagan. 



12. Tusk, 5 feet 6| inches long ; spiral arrangement of surface 



very strong. Goodsir Collection. 



