COMMON SEAL. 201 



black. The iris is brown, the pupil greenish, the 

 hind part of the eye internally being greenish-blue. 

 In the upper jaw the six incisors are of a some- 

 what conical form, the outer much larger ; the canine 

 teeth strong, conical, considerably curved, and 

 faintly marked with numerous longitudinal grooves ; 

 the five grinders on each side are placed obliquely in 

 the jaw, the anterior extremity of one passing in- 

 ternally of the posterior extremity of the next. 

 The first is smaller, with a single root, four 

 external points, and an internal tubercle ; the 

 rest have two roots, and are nearly of uniform 

 size, each having a large compressed conical point, 

 an anterior tubercle, and two posterior small points. 

 The last grinder is placed at a considerable distance 

 from the fourth, but the rest are approximated. In 

 the lower jaw, the four incisors are conical and 

 blunt ; the canine teeth curved, and longitudinally 

 grooved; of the five grinders on each side, four have 

 a large conical point, an anterior small tubercle, and 

 fcwo posterior small points, the last grinder a large 

 point, with two anterior and two posterior small 

 tubercles. The oesophagus is about two feet in 

 length; the stomach large, membranous, in the 

 form of an ovato-oblong sac, eighteen inches in its 

 greatest diameter ; the intestine forty-nine feet 

 long, its diameter uniform, being about eight lines, 

 in the rectum thirteen lines. 



