288 



MAMMALIA. 



the boundary between the buccal cavity and pharynx. All Mammals, 

 with the exception of the carnivorous Cetacea, have salivary glands, 

 a parotid, a submaxillary, and a sublingual, the fluid secretion of 



b 



H Nm 



Tr 



FIG. 675. Entrance to the digestive apparatus and the respiratory organs of the Cat (after 

 C. Heider). a, head with exposed salivary glands. P, Parotid; M, Sub-maxillary; Sti, 

 Sub-lingual, b, Longitudinal section through the Head and Thorax ; the Respiratory 

 organs are seen from the side. N, Nasal aperture ; Nm, Turbinal bones ; M, Mouth ; Z, 

 Tongue ; Pa, Velum palati ; Oe, Oesophagus ; I, Larynx ; E, Epiglottis ; Zb, Hyoid ; 2V, 

 Trachea; P, Lung; D, Diaphragm; T, Thyroid; B, Thymus; Tu, Opening of 

 Eustachian tube into the Pharynx; H, Cerebral hemispheres; C, Corpus callosum; 

 Cq, Corpora quadrigemina ; Cb, Cerebellum; .K, Spinal cord; Hy, Hypophysis; W, 

 Vertebral column ; St, Sternum, c, Longitudinal section through the Larynx () and 

 the first part of the Trachea (Tr). S, Vocal cord ; E, Epiglottis. 



which is poured out in large quantities, especially in the Herbivora. 

 The oesophagus, which follows the wide gullet, only exceptionally 

 presents crop-like dilations ; it is usually of considerable length, and 

 opens into the stomach behind the diaphragm (vol. i., fig. 50). The 



