Vermiform Appendix. 355 



mitchelli), Fig. 1, has a small appendix and complete atrophy of 

 the remainder of the caecum. With this complete atrophy the 

 muscle bands on the colon have become faint or they have dis- 

 appeared from view. The wombat sent from South Australia 

 (Phascolomys latifrons), Fig. 7, has a larger appendix than the 

 Victorian (Fig. 1), and the caecal atrophy is less complete; 

 muscular bands are well shown on the colon, Fig. 7. 

 Measurements — 



Caecum Verm, appeii. Stomacli Colon Sm. intestine 



Xoa/a - - 2.30 — .35 3.80 1.07 



Womlnit (young) 



F. mitchelli - .02? .012? .08 .65 1.73 



lVo7nl>at (adult) 



P. mitchelli - .05? .05 .50 5.60 3.27 



In the Koala the ratio of stomach to small intestine is 

 Stomach - - - 0.35 



Small intestines - 2.07 



•or rather less than one-sixth. 



In the Wombat the ratio of stomach to small intestines is 

 Stomach- - - 0.50 



Small intestine - 3.27 ' 



or about one-sixth. 



In the koala the ratio of large bowel to small bowel is 2.30, 

 plus 3.8, equals 6.10 of large bowel upon 2.07 of small bowel, 

 which roughly represents a preponderance of large gut over 

 small of 3 to 1. 



In tKe wombat the large bowel is 5.65, tlie small 3.27, or, 

 roughly, \\ to 1. This represents the ratio of large bowel 

 atrophy which has occurred in the wombat. 



Fig. 20 is an infantile wombat caecum. Its measurements 

 were made before we had worked out the forces of appendicular 

 formation, and we consider that these caecal measurements 

 •demand suppoi"t by measurements of further specimens before 

 we consider them acceptable. We shall therefore refuse to be 

 guided by the figures indicated by a query. It is quite clear, 

 however, that during the formation of the appendix in the 

 wombat the caecum a.s a functioning intestinal organ has been 

 lost by atrophic changes. 



The Tasmanian devil, having no cellulose to digest, and taking 



'JA 



