154 



SPECIMENS OF SIRENIA. 



18. Dugong, front of face of the adult male, reduced about 

 one-half, skeleton No. 1. See Plate XVI. The 

 nostrils are not shown. A pair of strong, tusk-like 

 incisor teeth, flattened from use, measured 1 inch in 

 breadth at the worn end. The development of the 

 premaxillse and incisors had elongated the muzzle 

 and raised the anterior nares to the dorsal aspect 

 of the fore part of the head. 

 Queensland. Donor — Sir Wyville Thomson. 



