No. 3.] WUSCLES AND NERVES IN AMIA CALVA., 595 
anterior root and between its anterior and posterior portions. 
While on the dorsal surface of the ganglion it lies between it 
and the ganglion of the ophthalmic and buccal branches of the 
facialis. It there receives a large branch from the direction of 
the ramus buccalis and truncus maxillaris, and, continuing down- 
ward and backward along the lateral surface of the ganglion, 
joins or becomes the jugular vein. Under the vein the anterior, 
or trigeminal, part of the ganglion becomes continuous with 
the posterior or facial portion. 
The ramus ophthalmicus superficialis trigemini arises from 
the extreme upper, anterior end or horn of the main ganglion, 
and the fibres that enter it do not apparently arise at all from 
the antero-ventral portion of the anterior root, or from the ante- 
rior transverse commissure of the ganglion. They arise, in 
large part, from the superficial portions of the median portion 
of the main ganglion, and run forward above and below the 
anterior commissure along the outer surface of the ganglion. 
A large bundle of these same fibres, arising from the ventral 
surface of the ganglion, joins the truncus maxillaris. 
The ganglion of the ophthalmic and buccal branches of the 
facialis lies, as already stated, immediately behind the upper, 
anterior and inner end or horn of the main ganglion. It 
- reaches to a somewhat higher level than that ganglion and is 
Y-shaped in form, as already described in my earlier work (No. 
3, p. 516), the anterior end of the main ganglion lying between 
and below the arms of the Y. Its ophthalmic branch is, in 
young larvae, much larger than the ophthalmic branch of the 
trigeminus, and at these ages the terminal buds on the top of 
the snout are not yet largely developed. In later stages, when 
the buds become numerous, the two nerves have about the 
same size. 
No fibres connecting the ganglion of the ophthalmicus and 
buccalis facialis with the main portion of the trigemino-facial 
ganglion were found in larvae or in the adult, but I cannot posi- 
tively say that they do not exist. The ganglion has a large, 
long root which runs at first inward and backward, and then 
directly backward along the side of the medulla, passing 
between it and the inner edge of the anterior wall of the ear 
