3. Forms with simple cæca of moderate size.
The Peramelidæ or bandicoots.
Fig. 353 shows the ileo-colic junction, cæcum and proximal segment of the colon in Perameles nasuta, the bandicoot.
Fig. 353.—Perameles nasuta, bandicoot. Ileo-colic junction and cæcum. (Columbia University Museum, No. 1481.)
4. Forms with sacculated short cæca, whose terminal portion is reduced to constitute a typical vermiform appendix.
The cæcum of the Phascolomyidæ or wombats, resembles, in its general structure and in the presence of a typical vermiform appendix, very closely the corresponding parts of the alimentary canal in man and the anthropoid apes. Fig. 354 shows these structures in Phascolomys wombat, the common wombat.
