The Anatomy of the Human Peritoneum and Abdominal Cavity / Considered from the Standpoint of Development and Comparative Anatomy

by George S. Huntington

Fig. 439.—Macacus cynomolgus, kra monkey. Abdominal viscera, hardened in situ. (Columbia University Museum, No. 1801.)

B. Arctopithecini.

The marmosets have a long crescentic-shaped cæcum, turning the concavity of the curve upwards and to the left, terminating in a blunt point.

Typical forms are shown in Fig. 440, Hapale jacchus, Fig. 441, Midas ursulus, and Fig. 442, Midas geoffrei.

Fig. 440.—Hapule jacchus, common marmoset. Ileo-colic junction andcæcum. (Columbia University Museum, No. 975.)
Fig. 441.—Midas ursulus, negro tamarin.Ileo-colic junction and cæcum;dried preparation. (Columbia UniversityMuseum, No. 235.)		Fig. 442.—Midas geoffrei, Geoffrey’s marmoset.Ileo-colic junction and cæcum; driedpreparation. (Columbia University Museum,No. 197.)

C. Cebidæ.

1. Ateles and other howlers have a large cæcum, crescentic in shape, narrowed at the apex, separated from the colon by a sharp and deep constriction, opposite the wedge-shaped ileo-colic junction.

The ileo-cæcal folds are well-developed and symmetrical, two equal vascular folds, and a free intermediate non-vascular reduplication.

Types: Ateles ater (Figs. 443-445), Chrysothrix sciureus ([Fig. 447]) and Nyctipithecus commersonii ([Fig. 446]). In Mycetes ([Figs. 448]-[450]) the pouch is shorter, less curved, with a slight reduction toward the less distinctly pointed apex.