22 



MR. A. H. GARROD ON THE 



[Jan. 4, 



lated caecum at about an inch from its open extremity, and its rela- 

 tions to it are not in any way peculiar. The sacculated caecum is 

 nearly two feet long, and is traversed by four longitudinal bands. 

 At its open end, which is an inch beyond (that is. further from the 

 csecal extremity than) the ileo-csecal valve, it is constricted by a 

 circular sphincter muscle, which forms the orifice of communication 

 with the rest of the cyhndrical large intestine. The cohc surface of 

 this sphincter is situated in the side of the colon, three inches from 

 the blind extremity of a true, simple, thick-walled, slightly pynform 



Fig. 2. 



Diagram of the convolutions of the colon in the Capybara. The dotted line 

 represents the caecum springing from the side of the dilated end of the 

 large intestine, and running forward to the diaphragm, a, ileo-csecal valve ; 

 h, rectum. 



caecum, which is directly continuous with the colon, and is indistin- 

 guishable from it in structure. This second caecum is, as indicated 

 above, three inches from the extreme end to the centre of the orifice 

 by which it communicates with the sacculated one. Superficially its 



