Dr Knox (m the Osteology <SfC. of the Dugong. 15T 



Human Human Gibbon 

 male adult female. female. Do. 



Art. XXIV.— zoological COLLECTIONS. 



1. Notice regarding the Osteology a7id Dentition of the Dugong. 



By Dr Knox. 

 A MORE detailed account of the facts connected with Dt 

 Knox's observations as to the anatomy of the Dugong, will 

 be laid before the readers of this Journal in a future number. 

 The results as given in a communication from the author are 

 as follows: — . 



\st^ No complete skeleton of this remarkable animal exists 

 in any of the European museums. If it exists, it has not been 

 properly described by an anatomist competent to the task. 



2d/?/, The incisive teeth in the upper jaw, exclusive of the 

 fang-like incisives, are thrown off or shed at an early period 

 and not replaced by others ; an extremely firm horny-looking 

 substance seems to supply the place of incisive teeth. It en- 

 crusts that remarkable sloping portion of the upper jaw, which, 

 together with a corresponding and opposite one in the lower 

 jaw, (also encrusted with a dense horny covering,) forms 

 an extraordinary feature in the general appearance of the face 

 of the Dugong. 



8f%, The incisive teeth in the lower maxillary bone remain 

 imbedded in their sockets throughout life ; they are neither 

 shed nor replaced. They seeem to be eight in number. 



