18 



DR. E. LOA'NBERG ON DIGESTIVE 



[Jan. 14, 



not represented in the figure.) The caecum of Pseiulochirtts is a 

 good deal larger than that of Trichostorus, as the above-recorded 

 comparative measni-ements indicate, and oiiers also quite another 

 aspect (compare figures). It is provided with two very strong 

 tfenife, Avhich continue to the blind end of the caecum. These 

 tfenife have an average breadth of 3 mm. and extend one on 

 each side. By means of these tfeniee and the mesentery the wall 

 of the cfecum is folded so that it forms three series of sacculi. 



Text-fig. 5. 



v.c.c. 



Caecum of Fseudochirus occidentalis. Nat. size. 

 c, colon ; ?., ileum ; v.c.c, ca?co-colic valve ; v.i.c, ileo-ca;cal valve. 



Throvigh this the efiectiveness of the caecum as a digesting organ 

 is greatly increased, the more so as the depth of the pockets is 

 comparatively great. The end of the caecum in this animal 

 is bluntly rounded, and thus diflferent from that of Trichosurus. 

 The first part of the colon is longitudinally plicated, but the 

 plicae are not strongly developed aiid soon disappear. 



