600 ALLIS. [Vou. XII. 
facialis. This branch of the facialis (offa/) arises inside the 
cranium from the upper surface of the nerve, near its origin 
from its ganglion, and issues with it through the ophthalmic 
foramen, lying along its upper surface. It then turns upward 
and backward, with the two frontal branches of the trigeminus, 
and having reached the upper surface of the chondrocranium 
turns medianward and backward under the frontal and parietal 
bones and supplies the anterior dorsal line of pit organs (No. 3, 
p. 513). In Ammocoetes the corresponding branch arises, 
according to Hatschek, from a small anterior portion of the 
facial ganglion, and is the nervus temporalis facialis or cuta- 
neus dorsalis facialis (No. 54, p. 156). It is, in Amia, always 
closely accompanied, after reaching the upper surface of the 
cranium, by the inner of the first two frontal branches of the 
ophthalmicus trigemini. 
The other or outer nerve of the first pair of branches of the 
ophthalmicus trigemini usually separates into two parts, both 
of which run almost directly backward along or near the outer 
edge of the temporal groove, and either unite again to form a 
single nerve or are connected by anastomosing branches. 
From the median one of its two parts an anastomosing branch 
is usually sent to the inner nerve of the pair. The lateral one 
is always directly continuous with a nerve formed usually by 
the fusion of two branches of the vagus. From the compound 
nerve thus formed several branches are sent to the dermal 
bones and underlying tissues of this part of the head, but 
which of these branches belonged to the trigeminus and which 
to the vagus could not be determined. 
Immediately in front of the inner one of the first two 
branches of the ophthalmicus trigeminus there were, on each 
side of the head in the specimen used for illustration, two 
branches arising close together and forming what may be for 
convenience called the second pair of frontal branches. About 
on a level with them, or a little in front of them, the branch of 
the facialis destined to supply organ 7 of the supraorbital sen- 
sory canal arises (off.so?). These three nerves all run upward 
and backward through the cranial cartilage and issue on the 
upper surface of the chondrocranium, but their course and 
