Fig. 400.—Genetta vulgaris, genet. Ileo-colic junction and cæcum. (Columbia University Museum, No. 1625.)   Fig. 401.—Felis concolor, puma. Ileo-colic junction and cæcum; dried preparation. (Columbia University Museum, No. 119.)
Fig. 402.—Felis borealis, var. rufus, red lynx. Ileo-colic junction and cæcum; dried preparation. (Columbia University Museum, No. 177.)   Fig. 404.—Herpestes sp.?, ichneumon. Ileo-colic junction and cæcum; dried preparation. (Columbia University Museum, No. 120.)
Fig. 403.—Paradoxurus typus, paradoxure. Ileo-colic junction and cæcum; dried preparation. (Columbia University Museum, No. 112.)   Fig. 405.—Herpestes griseus, mongoose ichneumon. Ileo-colic junction and cæcum; dried preparation. (Columbia University Museum, No. 149.)

From this type depart on the one hand the Ailuroidea, including the civets, ichneumons and true cats, with the cæcum 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 cæcal pouch ([Figs. 407]-[415]).

Fig. 406.—Proteles lalandii, aard-wolf. Ileo-colic junction and cæcum. (Columbia University Museum, No. 1520.)   Fig. 407.—Nasua rufa, brown coati-mundi. Ileo-colic junction. (Columbia University Museum, No. 1089.)
Fig. 408.—Nasua rufa, brown coati-mundi. Ileo-colic junction, opened, showing pyloric-like ileo-colic valve. (Columbia University Museum, No. 1581.)   Fig. 409.—Bassaris astuta, raccoon-fox. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 289.)
Fig. 410.—Mustela sp.?, marten. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 199.)   Fig. 411.—Taxidea americana, American badger. Ileo-colic junction; dried preparation. (Columbia University Museum, No. 180.)

Fig. 412.—Procyon lotor, raccoon. Ileo-colic junction; dried preparation. (ColumbiaUniversity Museum, No. 230.)

Fig. 414.—Ursus americanus, black bear. Ileo-colic junction; driedpreparation. (Columbia University Museum, No. 226.)

Fig. 413.—Cercoleptes caudivolvulus, kinkajou. Ileo-colic junction; driedpreparation. (Columbia University Museum, No. 295.)

Fig. 415.—Ursus maritimus, polar bear. Ileo-colic junction. (Columbia University Museum, No. 748.)