1882. ] MR. W. A. FORBES ON THE GREAT ANTEATER. 291 
slightly-elevated ridge, which in one specimen is divided into three 
or four slightly-marked papille. 
2. Brain.—The late Prof. Gervais has given, in his memoir on 
the brain of Edentata, figures of the superior, inferior, and lateral 
aspects of the brain of Myrmecophaga jubata, as well as of the cranial 
casts of that and the other species of Anteater’, Pouchet, in his 
‘ Mémoires,’ also gives figures of the cranial casts of Myrmecophega, 
and, in the article in the ‘Journal de l’Anatomie’ above cited, re- 
presentations of the brain itself of Zamandua and Cycloturus, that 
organ having been previously figured in the latter species by Tiede- 
mann °*. 
As I find Gervais’s figures of the brain in some respects unsatis- 
factory, I have taken this opportunity of giving representations of 
the brains extracted from my two specimens, including one showing 
the disposition of the deeper parts (figs. 2, 3, 4, pp. 292, 293). 
The olfactory lobes are very large, projecting forwards for *7 
inch in front of the cerebral hemispheres: in the lateral view of the 
brain they occupy, at least anteriorly, almost the lower half of the 
parts there exposed. They are continuous basally with the well- 
developed ‘‘ hippocampal lobe,” in front of which appears a large 
oval swelling of grey matter, on the middle root of the olfactory 
lobe, of an antero-posterior extent of more than half aninch. Towards 
their base, the olfactory tracts are curiously marked by slight trans- 
verse impressions (fig. 3) giving them a striated appearance, which 
may also be observed in the corresponding regions in the brains of 
Tamandua and Orycteropus. The cerebral hemispheres are but 
little arched superiorly* ; but the vermis ceredelli is very prominent, 
rising above the general level of the hemispheres (fig. 2). Viewed 
from above, the hemispheres appear somewhat truncated posteriorly, 
though they here completely conceal the corpora quadrigemina, 
abutting on the cerebellum (fig. 2). Attaining their greatest breadth 
anterior to this, a little in front of the level of the posterior end of 
the median fissure (1°95 inch long), they taper somewhat rapidly 
avteriorly. 
The cerebellum is well convoluted, with its lateral extent (1°5 
inch) greater than its antero-posterior (1°15). The vermis is 
much narrower than the lateral lobes; it is prominent, and in one 
specimen (the larger) considerably twisted on itself. The flocculi 
are distinct. 
The nates are much larger than the testes: the latter are very 
narrow from before backwards as compared with their combined 
transverse extent (‘075 : °6 inch), and are not distinctly separated 
from each other. The nates are larger, more prominent, and 
distinctly paired, being separated by a well-marked constriction ; 
they are somewhat triangular in shape, with their longer axis trans- 
verse. 
1 Nouv. Arch. v. pl. i. figs. 3, 3a, 30, pl. ii. figs. 1-3. 
2 Tcones cerebri Simiarum, pl. vy. fig. 8 
8 Gervais’s figure, /. ¢. fig. 3a, makes their outline much too convex antero- 
posteriorly. 
