Page 228. 
438 ON TOLYPEUTES TRICINCTUS. 
The sulcus present on the superoparietal cerebral surface of Dasypus 
sexcinctus is entirely absent in Tolypeutes tricinctus. 
The internal cerebral surface very:closely resembles that of Dasypus 
seacinctus as figured by Professor Turner. The corpus callosum is 
short, pointed in front, inclined obliquely upwards and backwards, 
being rounded and thick posteriorly, where it becomes continuous 
with the psalterium of the fornix. The anterior commissure is well 
developed. The sides of the corpus callosum are very much upturned. 
The calloso-marginal sulcus is feebly represented, being of about the 
length of the corpus callosum, and situate at a level a little anterior to 
it (vide fig. 2, d, p. 437). 
The corpora quadrigemina are large, and separated by a deep lon- 
gitudinal fissure, the pineal gland being extremely small. In the 
natural position of the spirit-preserved specimen it was quite impossible 
to cover the testes by the posterior margins of the cerebral hemispheres, 
which leads me to think that Professor Turner is hardly justified in 
his correction of Tiedemann, Cruveilhier, and Stannius, who all say 
that the corpora quadrigemina are uncovered by the cerebrum (in part 
at least) (vide fig. 2 a, p. 437). 
The median and lateral lobes of the cerebellum are nearly equal in 
size. The medulla is very large, and the fifth nerve is enormous. The 
optic nerves and commissure are insignificantly small. I could not see 
any corpora albicantia. 
With reference to the visceral anatomy of Tolypeutes tricinctus, the 
tongue was 23 inches long in my specimen, and ‘4 inch broad at the 
base. It is soft and elongate-triangular (lanceolate) in shape, flattened 
above. No circumvallate papille are visible, the others being incon- 
Spicuous and uniformly distributed. On the palate there are nine 
larger and smaller transverse ridges on each side, the interval between 
the last pair of molar teeth being smooth. The number of teeth is 
eight above and seven below, on each side. 
The epiglottis is slightly indented by a notch in the middle line; 
and the soft palate embraces it, so that the rima glottidis opens into 
the posterior nares, as in so many mammals, during ordinary respira- 
tion. A tonsilitic pit exists on each side of the fances. 
The lungs are divided into four lobes on the right side, and two 
on the left. In most Dasypodide there are three lobes on the left 
side; but in the animal under consideration the two upper were 
blended. This is said by most authors to be the number of lobes 
of the right lung; but I always find a fourth azygos lobe as well, 
hidden behind the heart, in the genera Dasypus and Xenurus, ab- 
sent in Tatusta. Dr. Murie’s figure of the lungs scarcely differs, 
except in the absence of division of the left upper lobe, from my 
specimen. 
n ait tai 
Ee eee 
—— - i. 
