No.3.] MUSCLES AND NERVES IN AMIA CALVA. 607 
terminal portions of those branches fuse, the buccalis, in a way, 
can be said to perforate the nerve so formed, as it does one of 
the corresponding nerves in Rana (No. 121, p. 117). The inter- 
nal branch of the nerve followed closely the maxillaris inferior 
and was distributed to dermal and subdermal tissues along its 
course, one long branch, ‘r.e,’ being sent downward behind 
the eye and another backward to join a branch of nerve ‘c,’ as 
already stated. The external portion of the nerve fused at once 
with nerve ‘d’ and the nerve so formed having crossed the 
buccalis between nerves 10 and 11, followed the course of the 
internal part of nerve ‘e’ lying immediately above it and fusing 
in part with it. It also sent an anastomosing branch to that 
branch of nerve ‘e’ that was distributed to tissues behind and 
below the eye. 
The four nerves a, 4, c, and e arose apparently from that part 
of the trigemino-facial ganglion that gives origin to the maxil- 
laris inferior. Nerve ‘d’ (7d) on the contrary arose by two 
roots from that portion of the ganglion that gives origin to the 
maxillaris superior. Both roots joined the external portion of 
Metvie, ec), 
e. Ramus Maxillaris Superior Trigemini. 
This nerve (mst) accompanies the buccalis in its course 
through the orbit, lying at first immediately under it and then 
immediately internal to it. The two nerves run downward and 
forward internal to, above, and in front of the first and second 
divisions of the levator maxillae superioris, and then dorsal to 
the third and fourth divisions of that muscle. They lie while 
in the orbit immediately external to, that is, behind or below, 
the periorbital lymph space. The membranes lining that space 
form a sort of sack which encloses the eye and eye muscles, as 
shown in Fig. 20, Pl. XXIII. In this figure the eyeball, which 
lies within the sack, and the fatty tissues which lie above and 
behind it, have been removed and the ventral nerves are seen 
through the membrane. 
As the maxillaris passes through the orbit it gives off several 
branches. ‘In the specimen used for illustration there were on 
each side of the head eight of these branches, seven of them 
