506 Proceedings of Royal Society of Edinburgh. [sess. 
lead to greater results than in primates : an order containing a 
large collection of animals of very diverse form, the classification 
of which, except on the broader lines, is none too firmly established. 
Any contribution to our knowledge of the anatomy of the lemurs, 
monkeys, and apes should be welcomed by the zoologist as well 
as by the morphologist. And the more precise and detailed it is 
possible to make the description, the more welcome it should be. 
It was, therefore, with much gratification that I recently 
received two monkeys not too long dead for the hardening of the 
entire body to be undertaken with the prospect of satisfactory 
results. It was felt that the fact that one of them belonged to 
the Cebidse and the other to the Cercopithecidse would permit of 
an interesting comparison of a Hew World with an Old World 
form. 
Both animals were full-grown males : the one, a Cercocebus 
fuliginosus (sooty mangabey) ; the other a Lagothrix humboldti 
(Humboldt’s woolly monkey). They were both injected with a 
10 per cent, solution of formol through the femoral artery; and 
in both the hardening was very satisfactory. So far only the 
abdominal viscera have been examined, with results as set forth 
in the following pages. 
It may be here stated that in both animals the stomach and 
intestines were practically empty ; therefore a comparison can be 
more easily made than would have been possible had these viscera 
been loaded with ingesta in the one, and empty in the other. 
Cercocebus fuliginosus. 
(Esophagus . — It is barely possible to speak of an abdominal 
portion of the oesophagus, for it enters the stomach immediately 
after it becomes free from the diaphragm. In its course through 
the diaphragm it forms a gentle curve in a dorsal direction, and so 
its junction with the stomach comes to be in the form of a fairly 
open angle (PI. I. fig. 1). 
Stomach . — This organ has a form of considerable interest, 
inasmuch as it can be divided into two parts, whose boundary is 
marked on the surface by the entrance of the oesophagus on the 
one side and by a constriction on the other (PI. I. fig. 1). These 
two portions may be designated, for the sake of convenience, the 
