212 



DR. P. CHALMERS MITCHELL ON THE 



appears in the Rorqual ; the whole proximal limb of the pendant 

 loop is thrown into very numerous minor folds ; the caecum is 

 placed more proximally on the loop, that is to say, nearer the 

 tip of the loop than in most mammals ; with the elongation of 

 the mesentery suspending Meckel's tra,ct, the recurrent limb, 

 composed in this case almost entirely of hind-gut, is unusually 



Text-figure 15. 



Intestinal tract of embryonic Halanoptera pln/salus. 

 S. Cut end of gut nearest stomach. R. Cut end of gut nearest anus. C. Csecum. 



long, and the rectum, although straight, is also long. In the 

 Toothed Whales, partly in relation to the diet of fish, Meckel's 

 tract has become enormously long and its minor loops very 

 numerous, the ctecuin has disappeared, and the recurrent limb has 

 shortened until no trace of it remains. The complexity of the 

 stomach is so elaborate and so alike in Toothed Whales and 



