774 ’ MR. W. N. PARKER ON THE INDIAN TaPIR. [ Dec. 19, 
hemispheres form marked oval elevations between the olfactory 
lobes and optic chiasma. 
Dareste’ gives a short description and diagram of the convolutions 
of the brain in the American Tapir; and Broca, in his admirable 
memoir (Anatomie comparée des circonvolutions cérébrales*), de- 
scribes the convolutions more fully, giving diagrams of an external, 
an internal, and a posterior view of the hemisphere; he, however, 
does not state to what species his description refers. Dareste’s 
figure differs entirely from the specimen under consideration, which 
also does not altogether agree with Broca’s account. 
The posterior part of each hemisphere presents three main gyri, 
which are much twisted, and differ considerably on opposite sides ; _ 
the outer of these is folded on itself at the posterior end, and is 
broader than the other two taken together. These constitute the 
four parietal convolutions of Broca. The internal and external gyri 
can be traced to the frontal region of the hemisphere; while the 
middle one, which is the simplest, stops short at about the line of 
junction between the anterior and middle thirds. The external 
gyrus is much folded in front. 
At about the middle of the hemispheres, the inner border of the 
internal gyrus passes gradually outwards, so that the posterior part 
of the callosal gyrus can be seen from above, thus differing from the 
Rhinoceros and resembling the Horse. There is a deep groove 
between the parietal and temporal lobes; and this fissure (Broca’s 
“are inférieur de la scissure limbique’’) extends forwards along a 
curved line to the rudimentary Sylvian fissure, beneath which are 
seen the small convolutions of the island of Reil; these are consti- 
tuted by the temporo-frontal fold, the other sub-Sylvian (temporo- 
parietal) fold described by Broca not being present. The temporal 
lobe is smooth. 
The corpus geniculatum and corpus mamillare are well marked. 
The pons Varolii is rather narrow, while the crura cerebri are long. 
The cerebellum, though relatively larger, resembles closely that 
of the Horse, and presents the same irregular appearance. 
On viewing the hemisphere from the inside (Plate LIX. fig. 4), 
the calloso-marginal sulcus (‘‘ are supérieur de la scissure limbique ” 
of Broca) is seen to bend down in front of the corpus callosum, as in 
the Rhinoceros and Horse, and does not, as in the Sheep and many 
other Ungulates, become superficial anteriorly. The large callosal 
gyrus is divided into two in its posterior part by a longitudinal 
fissure. 
Teeth.—All the milk-teeth were in place, the dental formula being 
d.i. =, d.c. = d.m. =e This corresponds with the usual state- 
“ments on the subject. Behind these, traces of the developing first 
and second true molars could be detected in the dry skull, lying 
1 «Tyroisiéme mémoire sur les circonvolutions du cerveau chez les Mammi- 
feres,” Ann. d. Sci. Nat. 4° série, Zool. iii. 1855, p. 65. 
Reyue d’ Anthropologie, t. vii. 1878, p. 385. 
