222 EDWARD PHELPS ALLIS, JR. 
on either side, the related nervus palatinus facialis, the nerves 
of opposite sides being separated from each other by a median 
ridge on the dorsal surface of the parasphenoid, and each ac- 
companied by a small branch of the internal carotid, given off 
just before that artery enters its foramen in the parasphenoid. 
This branch does not enter the myodome, but runs forward in 
a canal in the parasphenoid between what seem to be portions 
of the bone that are the one of membrane and the other of dental 
origin. 
The rectus inferior muscle of either side has its origin on the 
dorsal portion of the interorbital septum, near the level of the 
posterior edge of the basisphenoid. The rectus superior has its 
origin on the anterior edge of the horizontal myodomic mem- 
brane. The pituitary vein of either side enters the dorsal com- 
partment of the myodome in the subpituitary region, and, run- 
ning posteriorly in it, joins its fellow of the opposite side pos- 
terior to the membranous pituitary sac, there forming a large 
sinus. From this sinus branches are sent to the rectus externus 
muscles, and from its anterior end a small median branch is sent | 
upward, through the membranous roof of the myodome, into 
the cavum cerebrale cranii, where it immediately breaks up and 
cannot be followed in the sections. 
The pituitary vein of either side is joined by veins from the 
eyeball and the eye-muscles, these together forming what Allen 
(05) has called the internal jugular vein. I have also employed 
his term in certain of my works, in others calling it simply the 
jugular vein. This latter term is certainly the only one that can 
be appropriately employed, for the vein is the definitive vena 
jugularis, and as it is formed in part by the vena capitis media 
and in part by the vena capitis lateralis, neither of these terms 
can be employed excepting to designate certain sections of it. 
The internal carotid artery of either side traverses its foramen 
at the hind edge of the ascending process of the parasphenoid 
and enters the ventral portion of the ventral compartment of the 
myodome. There it gives off the orbitonasal artery and then, 
running forward into the subpituitary portion of the myodome, 
turns upward in that part of the median vertical myodomic 
