1909. | ANATOMY OF CERTAIN UNGULATA. 173 
vein. The first of these, which is the superior vertebral vein, 
supplies the first intercostal space; the next vessel is formed by 
the union of two twigs which supply the next two intercostal 
spaces. It will be seen that in detail the azygos system of this 
Antelope differs from that of other forms. But it is at present 
perhaps premature to compare the genus in this respect with 
other Cavicorn or Cervine ruminants. 
The Brain.—I believe that the brain of Antilocapra has not 
been described, though a “ cast of the cranium” is referred to in 
Text-fig. 11. 
Brain of adult Prongbuck (Antilocapra americana), dorsal view. Nat. size. 
a. Coronal sulcus. d. Suprasylvian. ¢. Lateral sulcus. £ Hntolateral sulcus. 
the Catalogue of the Museum of the Royal College of Surgeons*. I 
describe in the present communication a brain of an adult Anf#ilo- 
capra americana recently living in the Society’s Gardens. The 
outline of this brain as seen from the dorsal side is remarkable 
for the squareness of the anterior portion in front of the fissure 
of Sylvius, as seen in the accompanying figure (text-fig. 11) and 
as referred to under the description of the brain of JMadoqua 
on p. 190. 
The splenial sulcus is not apparent upon the dorsal surface of 
the brain ; its relations with the crucial sulcus anteriorly seem to 
me to be remarkable and unlike those of some other Artiodactyles. 
an Ve, BB); 
