134 MR. R. OWEN ON THE ANATOMY OF THE CHEETAH. 
traversed perpendicularly or transversely by three principal anfractuosities!, so that each 
hemisphere posterior to the first transverse fissure is composed of two mesial longitudi- 
nal convolutions with their deflected extremities (a. & b.), and four lateral perpendicular 
convolutions (c. d. e. & f.), which may be called principal or primary convolutions. 
In the Cheetah the first longitudinal convolution a. is traversed longitudinally by an 
interrupted fissure?, which, in the individual examined, extended further in the right 
than in the left hemisphere ; and I have observed that these secondary fissures are in 
general less symmetrical than the primary ones. In the Cat there is no increase of the 
surface of the brain by a secondary fissure of this kind. In the Lion there is a slight 
trace of it at the middle, and again at the posterior end of convolution a. In the 
Cheetah, Lion, Tiger and Puma, there are a few irregular transverse intersections®, 
extending about half way across this convolution from both sides. 
The convolution 6. in the Cheetah differs from that in the Lion, Tiger, Puma, and 
Cat, chiefly in its elevation above the plane of the hemisphere. In both the Cheetah 
and Lion it is broader in proportion to a. than in the Cat. The mass formed by the 
blending together of the convolutions a. and b. posteriorly, presents more partial fissures 
in the Cheetah than in the Lion or Cat; the continuation outwards of the secondary 
fissure 7 is constant in all the Feles. 
Of the lateral convolutions the middle ones d. and e. are the smallest in all the Feles, 
and do not project so far out as f. In the Cat the difference is but slight; in the 
Lion it is greater; and in the Cheetah the proportionate size of these convolutions is a 
little more increased. 
The small convolution g. is of about the same proportionate size in all the Feles ; 
but the brain at the part where b. and c. meet is broader in the Cheetah* than in either 
the Lion or the Cat. The cerebrum is also proportionately broader than the cerebellum 
in the Cheetah than in any of the Feles which I have examined. 
At the base of the hemispheres the principal and most constant anfractuosity is lon- 
gitudinal, extending along the outside of the olfactory nerve, and terminating ante- 
riorly in 8. Fig. 1. 
Another longitudinal fissure, posterior to the preceding, separates the natiform pro- 
tuberance from the blended convolutions e. and f. 
On the mesial surface of the hemispheres the anfractuosities are the same in number 
in the Cat and Cheetah, but are of greater extent in the latter. The transverse anfrac- 
tuosity® extends in both species downwards and backwards, to opposite the middle of the 
corpus callosum. Ihave found the same disposition of this convolution in the brains of 
two Lions; but Tiedemann, in his view of the brain of the Lion®, does not represent it 
14.5. & 6. Figg. 2. & 5. 27. Fig. 1. 39. Fig. 1. 
4 This difference is expressed in the form of the cranium, which, as Cuvier has observed (Ossemens Foss., 
tom. iv. p. 446.), is the shortest, most convex, and proportionately the broadest, of any of the species of Felis. 
51. Figg. 1. &3. 5 Icones Cerebri Simiarum, &c. Tab. iii. fig. 5. 
