CHAP. IV] THE GENERAL ANATOMY OF THE CERCOPITHECIDAE 149 



Lastly the occasional though anomalous occurrence of a stomach of Semno- 

 pithecine form in adult human beings is not unknown. Such an instance has 

 been recorded by Melsome 1 . More striking even than this, however, are the 

 examples described by Professor Schwalbe 2 , who has confirmed and extended 

 the observations of Professor Keith and Dr Wood-Jones 3 on the form of the 

 human foetal stomach. 



These observers have shewn that the human foetus from the third to the 

 fifth month of intra-uterine life possesses a remarkable diverticulum at the 

 cardiac end of the stomach. Later in development this diverticulum dis- 



Fig. 94. Viscera of a Nasalis monkey (Cercopithecidae) : the extraordinarily 

 modified form of the stomach and the consequent displacement of the liver to the 

 right are to be noticed. These features are found throughout the genus Semno- 

 pithecus, which includes many species of monkeys found in Asia. (Cf. Fig. 22.) 

 1, Stomach; 2, Liver; 3, Pancreas; 4, Spleen; 5, Duodenum; 6, Caecum. 



appears, but while present, it is lined with a specially corrugated mucous 

 membrane. Observations on the stomachs of foetal Semnopitheci shew that 

 the peculiar modification found in the adult organ consists in a dilatation 

 of the fundus (or as Schwalbe suggests, the cupola) which incorporates the 

 diverticulum. A second division of the stomach called Tubus gastricus is 



1 Proc. Anat. Soc, May 1895. 

 3 Proc. A nnt. Soc, Nov. 1901. 



- Z.f. A. u. M. 1912, Sonderheft n. 



