THE ORDER CETACEA. 121 



the bone, pass out by another large hole on the inside 

 of a hole that is situated about two feet from the back 

 of the condyle. 



The Os Linguale*, or Bone of the Tongue. — This is 

 of a triangular shape, and its appendages make it appear 

 an immense volume of bone ; it is situated between the 

 shoulders, and above the bones forming the sternum or 

 bone of the chest or breast. The body of this lingual 

 bone is curved in its form, the convexity of which pro- 

 jecting anteriorly, its inferior margin is crescent-shaped. 

 There is to be observed a semilunar cavity at its smallest 

 part, which, with the cartilages and ligaments, aids in 

 the living animal towards forming the cavity of the 

 throat. On its sides are some asperities, which give 

 attachment to some of its powerful ligaments, &c. The 

 top contains a deep sulcus or furrow, likewise lined with 

 a similar surface, for the purpose of allowing origin and 

 insertion to the muscles of deglutition. The bony ap- 

 pendages of this bone are two in number, and are arti- 

 culated by means of loose ligaments to two extremities 

 of the lingual bone. They are curved throughout their 

 length, the convexity approaching inwards, where is a 

 large and almost circular space in their upper part, that 

 in the living animal contains enormous masses of fat. 

 The remainder of these appendages are smooth, and ap- 

 pear only to give connection to a few muscular fibres. 



THE STRUCTURE OF THE SPINE. 



This portion of the skeleton is composed of fifty-four 

 bones, and, with the head, forms a length which at first 



* I use the term " Os Linguale," as more expressive of its use and 

 situation, than the word " Os Hyoides" signifies particularly to the non- 

 professional reader. See my " Synoptical Tables of an improved Nomen- 

 clature for the Sutures of the Cranium in Man, and the Mammalia," &c. 



