[Illustration: FIG. 398.--_Canis familiaris_, dog. Ileo-colic junction and caecum, Type I. (Columbia University Museum, No. 1550.)] [Illustration: FIG. 399.--_Canis familiaris_, dog. Ileo-colic junction and caecum, Type II. (Columbia University Museum, No. 1551.)] From this type depart on the one hand the _Ailuroidea_, including the civets, ichneumons and true cats, with the caecum uniformly present, but short and markedly pointed, suggesting the degeneration of a formerly better developed structure (Figs. 400-406), while on the other the _Arctoidea_, including the bears, weasels and raccoons, constitute a group united by many common fundamental peculiarities of structure, among which is the entire absence of a caecal pouch (Figs. 407-415). [Illustration: FIG. 400.--_Genetta vulgaris_, genet. Ileo-colic junction and caecum. (Columbia University Museum, No. 1625.)] [Illustration: FIG. 401.--_Felis concolor_, puma. Ileo-colic junction and caecum; dried preparation. (Columbia University Museum, No. 119.)] [Illustration: FIG. 402.--_Felis borealis, var. rufus_, red lynx. Ileo-colic junction and caecum; dried preparation. (Columbia University Museum, No. 177.)] [Illustration: FIG. 403.--_Paradoxurus typus_, paradoxure. Ileo-colic junction and caecum; dried preparation. (Columbia University Museum, No. 112.)] [Illustration: FIG. 404.--_Herpestes sp.?_, ichneumon. Ileo-colic junction and caecum; dried preparation. (Columbia University Museum, No. 120.)] [Illustration: FIG. 405.--_Herpestes griseus_, mongoose ichneumon. Ileo-colic junction and caecum; dried preparation. (Columbia University Museum, No. 149.)] [Illustration: FIG. 406.--_Proteles lalandii_, aard-wolf. Ileo-colic junction and caecum. (Columbia University Museum, No. 1520.)] [Illustration: FIG. 407.--_Nasua rufa_, brown coati-mundi. Ileo-colic junction. (Columbia University Museum, No. 1089.)] [Illustration: FIG. 408.--_Nasua rufa_, brown coati-mundi. Ileo-colic junction, opened, showing pyloric-like ileo-colic valve. (Columbia University Museum, No. 1581.)] [Illustration: FIG. 409.--_Bassaris astuta_, raccoon-fox. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 289.)] [Illustration: FIG. 410.--_Mustela sp.?_, marten. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 199.)] [Illustration: FIG. 411.--_Taxidea americana_, American badger. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 180.)] [Illustration: FIG. 412.--_Procyon lotor_, raccoon. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 230.)] [Illustration: FIG. 413.--_Cercoleptes caudivolvulus_, kinkajou. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 295.)] [Illustration: FIG. 414.--_Ursus americanus_, black bear. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 226.)]