50 Dr. Wyman on the Cranium and 
in the cranial walls which lodges one of the meningeal vessels 
and corresponds with the foramen spinale of human anatomy. 
In the African elephant the separation is carried still farther, 
the one of bone on opposite sides approaching very near to 
each other. 
The Curolid foramen is situated behind the petrous bone, but 
is formed equally (when seen from below) by an indentation 
into the petrous and basilar bones; it is at first of an oval form, 
its long diameter being three-fourths of an inch, but soon be- 
comes round and diminishes to a half of an inch ; as it ascends: 
vertically, it becomes more completely imbedded in the petrous 
bone, and as it enters the cranial cavity as seen from within, 
it is wholly contained in it; at this point it becomes continuous: 
with a groove, which runs forwards on the sides of the sella 
turcica and terminates just within the anterior clinoid process. 
From ps carotid canal a small opening transmits probably a me- 
ning 
In bath the African and Asiatic cliphonte this foramen exists 
: milar connection with a groove on each side of the 
sella neat in the former species it is wholly imbedded at its 
commencement in the petrous bone. ‘This foramen is not. men- 
tioned by Cuvier, neither in his Ossemens Fossiles nor in his 
Anatomie Comparée ; he describes the foramen ovale en that 
which transmits the carotid artery as forming one opening.* 
stated above, the foramen spinale and foramen ovale are united 
together, but the first obviously serves only to transmit menim- 
geal vessels. 
The Internal Auditory foramen is much i and fovea a 
fissure on the upper surface of the petrous bon 
Between the petrous bone and the basilar ahasrint of the occiptt, 
more external than the carotid foramen, is a fissure three inc! 
in length, which serves to transmit the hypoglossus. nerve, and 
is therefore the representative of the anterior Condyloid fora- 
men; the external part of the same fissure is more narrow and 
is continuons with the lateral sinuses, and is in consequence t0 
be regarded as the jugular fossa, tho ough the jugular vein must 
become very much flattened in order to escape from the he eranial 
cavity. 
The Stylo-mastoid foramen is one-fourth of an inch in diameter 
The Euasoeiians 
which last is prolonged into a spine. ‘The Vidian canal is sf 
great size, forates the pterygoid process near t | 
of an oval form and has a diameter of about tossdaie of an 
inch; the posterior gh ne in close proximity to the foramen — 
ovale and the anterior the foramen rotundum, which it nearly 
od 
* Lecons d’ Anat, Comp. Tome i, . 
