ALIMENTARY TRACTS AND ADJACENT GLANDS 93 



glands are a trifle better developed in Homodontomys and 

 Neotoma than in Teonoma, which fact conforms to expec- 

 tations, for the food of the last subgenus is indicated 

 as being the least starchy in character. 



On the other hand, the secretion of the submaxillary 

 glands is comparatively more viscid because containing 

 more mucin, which acts as a lubricant during the degluti- 

 tion of coarse, dry fodder, such as Teonoma uses in larger 

 amount. In this subgenus the submaxillary glands are 

 broader, better defined, and probably more efficient than 

 in the other two, as previously mentioned. 



Oesophagus. The more cephalic portion of this lies dor- 

 sad of the trachaea, but as it passes caudad it extends 

 slightly laterad of the latter. In Teonoma it does not ex- 

 tend so far laterad. It is attached to the trachaea and the 

 vertebrae by tissue. The length, from the larynx to the 

 stomach, is from 60 to 75 mm., depending upon the size 

 of the animal. 



Stomach. This is U-shaped, the cardiac and pyloric di- 

 visions being very distinct, and the adjoining surfaces 

 are connected to one another by tissue, thus bringing the 

 oesophagus and duodenum into juxtaposition. When 

 moderately distended with food, the stomach in two speci- 

 mens measured 37 by 30 and 40 by 32, with thickness of 

 14 and 16 mm., respectively. Measuring from the base of 

 the incisura angularis between the horns, the cardiac ex- 

 tended 24 and 22 mm., and the pyloric horn, 19 and 20 mm. 

 The former was slightly muscular, with glandular folds upon 

 its inner wall, but the pyloric horn was almost devoid of 

 muscle fibers. At the base of the stomach upon its ental 

 surface there was a sharply defined circular area, 20 mm. 

 in diameter and about 2 mm. in thickness, of a reddish 

 brown color in the preserved specimen, surrounded by 

 stratified squamous epithelium. Bensley (1902) desig- 

 nates this area as a fundus gland. No histological exam- 



