52 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
components of the trigeminal nerve will be preceded by a more general 
statement. The main branches of this nerve correspond quite closely 
with the typical condition found in lower vertebrates. The ophthalmi- 
cus profundus, proceeding from its own independent ganglion, is 
- distributed to the skin of the dorsal surface of the head over an area 
extending from a post orbital region forward to the tip of the snout, 
the frontal region receiving its fibers over a special ramus, which leaves _ 
the ophthalmic at the ganglion; the rest of the nerve, as the nasalis 
branch, takes the course through the orbit typical of the profundus, — 
receiving the long root of the ciliary nerve on its way, and supplies 
the skin of the dorsal surface of the snout and the epithelium of ante- 
rior nasal chamber. 
The second and third (maxillary and mandibular) branches of the 
trigeminus join the main trigeminal ganglion as large branches from 
the upper and lower jaw regions. ‘The maxillary supplies the skin 
around the eye and the upper and lower lids; it crosses the floor of the 
orbit to the upper jaw, in which it runs forward to the tip of the snout, 
supplying the skin lateral to the jaw and the epithelium of the gums 
and the teeth. | 
The mandibular branch passes down to the lower jaw, which it 
enters, supplying the skin, gums and teeth in a manner similar to that 
described for the upper jaw. It also supplies the anterior regions of 
mouth and tongue. In this latter distribution it is closely associated 
with the somatic motor components of XII and the viscero-sensory 
components of the chorda tympani. Certain plexuses and anasto- 
moses omitted from this general account will be included in the de- 
tailed description which follows. 
I. Nervus ophthalmicus profundus. This term, as including all the 
fibers entering the ophthalmic ganglion, has no application in Anolis, 
as the two main branches (r. nasalis and r. frontalis) do not unite distal 
to the ganglion. These two branches will be described as the frontal 
and nasal rami. 
Ia. Ramus frontalis (f.)— The point where in different reptiles 
the frontal ramus joins the nasalis is determined somewhat by the 
relation of the ganglion to the orbit. In Anolis (Plates 2, 3) the 
orbit is large and the frontal ramus takes rather an abrupt dorsal 
course to reach the skin posterior to it; the ramus therefore joins the 
ganglion directly. The frontalis is about half the size of the nasalis. 
Both are composed of the same kind of fibers, except that the nasalis 
carries the non-medullated fibers of the radix longa of the ciliary 
nerve, which collectively can be recognized from the beginning of the | 
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