1882.] MR. W, A. FORBES ON THE GREAT ANTEATER. 291 



slightly-elevated ridge, which iu one specimen is divided into three 

 or four slightly-marked papillae. 



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 ol' Mynnecophagajubata, as well as of the cranial 

 casts of that and the other species of Anteater^ Pouchet, in his 

 ' Memoires,' also gives figures of the cranial casts of Mi/rmecophaya, 

 and, in the article in the ' Journal de I'Anatomie' above cited, re- 

 presentations of the brain itself of Tamandua 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 an inch. 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 cerebelli 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 quadriyemina, 

 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 (r95 iuch long), they taper somewhat rapidly 

 anteriorly. 



The cerebellum is well convoluted, with its lateral extent (1*5 

 iuch) 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 fiocculi 

 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. 



' Nouv. Arcb. v. pi. i. figs. 3, 3a, ob, pi. ii. figs. 1-3. 

 ^ Icones cerebri Siuiianim, pi. v. fig. 8. 



3 Gervais's figure, /. c. fig. i> a, makes their outline much too convex antero- 

 posteriorly. 



