by US) | 
XIV. On the Anatomy of the Great Anteater (Myrmecophaga jubata, Linn.).—Part II. 
By Professor Owen, F.R.S., F.Z.8. &c. 
Read February 10, 1857. 
In my former communication on the Anatomy of the Great Anteater’, the position of 
the stomach and its relations to adjoining viscera were briefly pointed out. In the 
present paper I propose to describe the form and structure of this very remarkable 
organ in the Myrmecophaga jubata. 
Moderately distended (Pl. LI.), the stomach presents a subglobular form, of about 
8 inches diameter, with a smaller subglobular appendage as it seems, of about 3 inches 
diameter (9, g,), intervening between the main cavity (c, c) and the intestine (m). 
The cesophagus (a) terminates near the middle of the upper surface of the main 
portion, of which about 4 inches extend to the left of the cardia, to form what Haller 
called the ‘saccus cecus.’ The general configuration of the stomach, as seen from 
the anterior surface, is shown in Plate LI. 
On the middle of both the anterior and posterior surfaces of the stomach is a sheet 
of tendon (d), of an irregular triangular form, 6 inches in longest diameter, which is in 
the direction of the length of the stomach, and in which the tendon extends from the 
large to the small division of the organ, expanding upon both divisions, but acquiring 
upon the latter its greatest thickness and whitest colour. 
Upon bisecting the stomach lengthwise, as in Plate LII., the part described as the 
main cavity (c, ¢) is seen to correspond with the cardiac division, and the appendage (h, ‘) 
to correspond with the pyloric division of the stomach, in Rodentia: but they are much 
more distinct in structure and functions in the Myrmecophaga jubata than in any other 
mammal with a stomach similarly divided externally. The cardiac cavity has a vascular 
secreting surface, the lining membrane being disposed in very numerous small wavy 
rug: at the parts where the parietes have yielded most to the distending force, 
the ruge are nearly effaced: other larger and more permanent folds are confined to 
the vicinity of the communication (f) with the pyloric cavity, and converge towards the 
aperture (Pl. LIII. fig. 1, e). 
The cardiac orifice in the inverted stomach (PI. LIII. fig. 1, 5) presents the form of 
a narrow, slightly bent crescentic slit. It is situated about 35 inches from the similarly 
shaped aperture (f) of communication between the cardiac and the pyloric cavities : 
1 Trans. Zool. Soc. vol. iv. p. 117. 
