SOME INTERNAL STRUCTURES 59 



stomach of man is divided by constrictions into three 

 chambers.* Amono- rodents it is common for the 



o 



stomach to be divided into two more or less sharply 

 marked off chambers by a median constriction. This 

 chambering of the stomach is, however, carried out 

 to a large extent only in the Sirenia (Manatee), the 

 Sloth, the Ruminants (oxen, antelopes, deer, camels), 

 and in the whales. It must not be at once concluded 

 from this circumstance that the whales are related 

 intimately to one or other or to all of these groups. 

 We shall see presently that the divided stomach of 

 the whales is essentially different from the divided 

 stomach of the other animals. They simply have in 

 common the bare fact that it is divided. 



But before proceeding to generalities it will be 

 convenient to lay before the reader some of the 

 facts. We cannot give here a detailed account of the 

 stomach in the entire order. Dr. Jungklaus,f the 

 most recent writer upon the subject, quotes no less 

 than sixty-three memoirs, apart from his own, which 

 deal entirely, or more or less incidentally, with the 

 Cetacean stomach. To this memoir of Dr. Jungklaus' 

 we must refer for additional details, and for this list 

 of literature. 



The common porpoise may conveniently serve as 

 a starting-point. Its stomach is among the least 

 complicated, and it is clearly the most accessible of 

 whales for study. In that creature the stomach has 



* WIEDERSHEIM, The Stmcture of Man. Ed. by Howes. Macmillan 

 and Co. 



t "Der Magen der Cetaceen," Jen. Zeitschr., xxxii., p. i. 1898. 



