THE GRAY RABBIT, OR COTTON TAIL 89 



difference in the softness and roughness of the anterior 

 and posterior part of the tongue ? The free anterior part 

 has taste papillae on its surface. On the posterior part of 

 the tongue are four large papilla arranged transversely 

 across the tongue in a curved line. 



The middle part of the roof of the mouth is termed the 

 palate. The anterior portion has transverse ridges, and 

 is hard, hence is called the hard palate. The posterior 

 portion is without ridges and is soft, hence is called the 

 soft palate. Note that the soft palate terminates in a free 

 pendulous flap. Just above the free end of the soft palate 

 find the nasal opening, or chamber. Now cut away the 

 soft palate and find the two tubes, Eustachian tubes, that 

 lead from the ears into the nasal chamber, one on each side. 



There are also ducts from four pairs of salivary glands 

 entering the mouth. If possible, find these glands and 

 their ducts. 



The parotid gland lies just below and in front of the ex- 

 ternal auditory canal. The duct leading from it passes an- 

 teriorly, and opens on the inside of the cheek opposite the 

 second upper molar tooth. 



The two submaxillary glands lie between the angles of 

 the lower jaw. Their ducts open on the floor of the mouth 

 beneath the tongue, about half way between the base of 

 the tongue and the lower incisors, and near the median 

 line. 



The sublingual gland lies on the inside of the mandible a 

 little anterior to the base of the tongue. It is small, and its 

 duct is difficult to find, but opens under the tongue. 



The infraorbital gland lies just below and in front of the 

 eye. Its duct passes downward to the cheek, and opens 

 near that of the parotid gland. 



