A similar type of caecal reduction is encountered in the Pinnipede Carnivora. Fig. 396 shows the ileo-colic junction and the short blunt caecum of the harbor seal, _Phoca vitulina_. 2. The caecum of the typical Felidae, other than the lion, is short and the terminal portion much reduced in caliber, constituting in many forms a species of pointed rudimentary appendix (Fig. 465, _III_, _B_, 2). Fig. 401 represents the typical feline caecum as seen in the puma, _Felis concolor_. Among the smaller AEluroid Carnivora related to the true cats, as the civets and ichneumons, the terminal reduction of the short caecum is still more marked, as seen for example in _Herpestes griseus_ (Figs. 404 and 405). 3. In the Arctoid group of Carnivora (Fig. 465, _III_, _B_, 3 and 4) the reduction of the caecal apparatus has been carried to the complete elimination of the pouch, restoring the primitive type of a straight intestinal tube without diverticulum as encountered above in some of the Edentates (Figs. 356 and 357). In some forms allied to the true bears, such as _Procyon_, _Bassaris_, _Cercoleptes_, _Taxidea_ and _Nasua_, the ileo-colic junction is marked externally by a slight constriction and internally by the projection of an annular pylorus-like valve (Figs. 407-409). The transition from the thin-walled ileum to the thick muscular walls of the large intestine is abrupt. The latter is very short and usually increases in caliber as it approaches the anal orifice. The mucosa of the terminal ileum presents very commonly one or two large oval areas of agminated follicles near the ileo-colic junction. The mucous membrane of the large intestine is thrown into prominent longitudinal folds. Fig. 408 shows the intestine of the brown coati, _Nasua rufa_, opened on each side of the ileo-colic transition. In some of the Arctoidea, as _Procyon_ and _Nasua_, the beginning of the colon just beyond the ileo-colic valve is bowed out opposite the mesenteric border indicating the original site of the eliminated caecum, and recalling the arrangement of the intestine encountered above in _Arctopithecus_ among the Edentates (Figs. 363, 407, 412, and 465, _III_, _B_, 3). Moreover, in the same forms rudimentary vascular and serous folds around the ileo-colic junction, corresponding to similar structures found in connection with a well-developed caecal apparatus in other mammalia, point to the former existence of a caecum. 4. In the typical Ursidae even these remnants and traces of a caecal pouch have disappeared and the intestinal canal preserves a uniform caliber, without any differentiation of large and small intestine (Figs. 414 and 415, Fig. 465, _III_, _B_, 4). C. The last subdivision of the third main group contains forms in which the large uniform pouch of the primal type appears moderately reduced in length and sacculated, terminating either in a blunt extremity or carrying a distal constricted and rudimentary segment as an appendage.