932 



MR. F. E. BEDDARD ON THE ANATOMY 



[Dec. 14, 



mandible. More than one half of the cartilage, however, lies 

 posteriorly to the angle of the jaws. When the hyoid body is ex- 

 posed by cutting the superjacent muscles of the throat it is seen 

 to lie close to and even in contact with the thyroid cartilage. 

 The thyro-hyal ligament of course exists, and the hyoid can by 

 stretching be removed from its contiguity to the thyroid cartilage 

 of the larynx. But when the tension is relaxed the bone and the 

 cartilage are again brought into contact. It is especially to be 

 noted that there is no dilatation of the hyoid such as occurs in 

 Mycetes ; the bone in Pitheda pithecia is of quite normal form. 



Text-fie-. 288. 



Hyoid and larynx of FWiecia pithecia viewed from the ventral surface. 

 Hi/. Hyoid. T. Thyroid body. TJi. Thyroid cartilage of larynx. 



Sir W. Flower's account of the anatomy of Pithecia monachus 

 (5), which touches upon most of the viscera, contains no men- 

 tion of the laryngeal structures, with which species therefore I 

 am not able to compare Pithecia pithecia in this respect. The 

 thyroid cartilage, as already mentioned, is very large. It is of 

 spherical aspect and measurements confirm this ; the length was 

 20 mm. and the breadth 21 mm. The texture of the inflated 

 bulla shows that it is entirely cartilaginous. I could find no 

 ossification anywhere. The animal, it is to be recollected, is a 

 male. It is important to take notice of the facts which have just 



