262, DESCRIPTION OF THE PLATES. 



ear with the upper eyelid. A similar strip has been drawn as left in situ 

 overlying the costal attachment of the diaphragm. 



a. Left eye. 



b. Left ear. 



c. Diaphragm forming a contractile dome-shaped floor between the abdo- 



minal cavity below and the thoracic above. 



d. Eleventh dorsal or anticlinal vertebra. 



e. Spinal cord. The part where it widens into the medulla oblongata is 



concealed by the large external ear. 



f. Part of Harderian gland, which discharges its secretion by a duct open- 



ing under the rudimentary third eyelid or nictitating membrane. 

 This gland is found in most mammals, with the exception of Chirop- 

 tera and Simiadae. 



g. Intra-orbital portion of lacrymal gland. 



g'. Extra-orbital portion of lacrymal gland, lying upon the masseter 

 muscle. It sends a duct with some glandular tissue inlaid in its walls 

 to enter the orbit at its posterior angle, and receive the duct of the 

 intra-orbital portion (g\ 

 : h. Cerebral hemisphere of right side. 



i. Vagina. 



j. Parotid gland. Its ducts are seen to converge from its constituent 

 lobules, which are loosely aggregated from the neighbourhood of the 

 ear to that of the acromion, and to cross, when united, the ramifica- 

 tions into which the motor nerve of the facial muscles is seen to 

 break up. The buccal pouch is wanting in the true Mures. Some 

 lymphatic glands have been removed from the space between the 

 masseter muscle and the parotid gland. 



k. Portion of ' hibernating gland ; ' a gland found in many Rodentia, 

 Chiroptera, and Insectivora, and spreading in them into the axillary, 

 the nuchal, the thoracic, and even occasionally into the abdominal 

 regions. 



/. Submaxillary gland and duct. 



m. Heart ; the line ends upon the left ventricle. The apex of the heart 



is not turned so much to the left as in man and in some of the lower 



mammals, e.g. the moie. The fold immediately below the point 



. where the line abuts upon the ventricle is formed by the cut edge of 



the pericardium. 



n. Left auricle. 



o. Phrenic nerve. 



/. Aorta. A bristle has been passed between it and the left azygos vein, 

 and abuts on the diaphragm where the left phrenic nerve enters it. 

 Behind this bristle are seen, passing from the aorta to the sternum, 

 first, the third lobe of the right lung ; secondly, the oesophagus ; 



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