Fig. 420.—Nycticebus tardigradus, slow lemur. Ileo-colic junction, cæcum, appendix, and colon; dorsal view. (Columbia University Museum, No. 20/1468.)

Fig. 421.—Nycticebus tardigradus, slow lemur. Same preparation as Fig. 420; ventral view, showing spiral coiling of proximal colon. (Columbia University Museum, No. 20/1468.)   Fig. 422.—Nycticebus tardigradus, slow lemur. Ileo-colic junction, cæcum, appendix, and spiral colon. (Columbia University, Study Collection.)
Fig. 423.—Lemur macaco, lemur. Ileo-colic junction and cæcum. (Drawn from preparation.) (Columbia University Museum, No. 1623.)   Fig. 424.—Lemur mongoz, lemur. Ileo-colic junction and cæcum. (Drawn from preparation.) (Columbia University Museum, No. 1473.)
Fig. 425.—Otolicnus crassicaudatus, galago. Ileo-colic junction and cæcum. (Drawn from preparation.) (Columbia University Museum, No. 1626.)   Fig. 426.—Tarsius spectrum, spectre lemur. (Drawn from preparation.) (Col­um­bia Uni­ver­sity Museum, No. 1521.)

2. Suborder Anthropoidea.

A. Cynomorpha.

1. Cynocephalus.—The baboons have a well-developed capacious cæcum. The apex of the pouch is usually blunt and rounded, or only slightly pointed. The cæcum is sacculated, conforming in structure to the rest of the large intestine. Two low vascular folds or ridges, a ventral and a dorsal, carry the ventral and dorsal cæcal branches of the ileo-colic artery. The intermediate non-vascular fold is large, frequently fused with the dorsal vascular fold (cf. [p. 264]).

Figs. 427-433 show the structures in Cynocephalus sphinx, porcarius, babuin, anubis and in Cercopithecus pogonias, sabæus and campbellii.

Fig. 427.—Cynocephalus sphinx, Guinea baboon. Ileo-colic junction and cæcum. (Columbia University Museum, No. 1082.)