CRANIAL NERVES 
mxz.3, r. maxillaris V, fibers associated 
with the lateral division of r. buccalis 
VII (bue. 3) 
nas., nose and nasal cavity 
ne., nasal cartilage 
ne., nasal epithelium 
ngm., median nasal gland=gland of 
Jacobson 
oc., eyeball 
occ., occipital condyle 
oma., Mm. omo-arcualis 
op., r. ophthalmicus profundus V 
opc., oS operculare=spleniale 
op.1, rm. ophthalmicus profundus mi- 
nor V 
op.2, rm. nasalis internus V 
op.2a, small median branch of the pre- 
ceding innervating the extreme tip 
of the snout 
op.3, rm. nasalis externus V 
op.4, rm. palatinus profundus V 
op.4l, rm. pal. prof. V, lateral division 
op.4m., rm. pal. prof. V, medial division 
op-mx., union of ophthalmicus profun- 
dus and maxillaris fibers sharing in 
the profundus-palatine anastomosis 
op-pal., anastomosis of r. ophthalmicus 
profundus V with r. palatinus VII 
op-pal.l., lateral portion of the op-pal. 
anastomosis 
op-pal.m., median portion of the op-pal. 
anastomosis 
os., Yr. ophthalmicus superficialis VII 
osph., orbitosphenoid bone and ecar- 
tilage 
pa., os parietale 
pal., r. palatinus VII 
pal.1, median division of r. palatinus 
VII 
pal.1a, median branch of the preceding 
pal.2, lateral division of r. palatinus 
VII 
pe., palatinus caudalis 
ph.i-a, a posterior pharyngeal branch 
of the r. int-acc. X 
phe., pharyngeal epithelium 
pmz., premaxilla 
po., postorbital process, or cartilage 
OF SIREN LACERTINA 
251 
psph., parasphenoid 
pt., pterygoid muscle and nerve branch- 
es innervating it 
qu., quadrate cartilage 
rext., m. rectus externus 
rinf., m. rectus inferior 
rint., toa. rectus internus 
rs., m. rectus superior 
rtao., retractor muscle of the antor- 
bital cartilage 
sao., mm. subarcuales obliqui 
sar., m. subarcualis rectus 
sh., vestigial muscle to which the palat- 
inus caudalis is related 
so., m. obliquus superior 
spro., nerves of mixed composition from 
base of supraorbital trunk 
s-r., Yr. recurrens sensitivus X 
s-r.1, first pharyngeal branch r. re- 
currens sensitivus 
s-r.2, second pharyngeal branch r. 
recurrens sensitivus 
spt., r. supratemporalis X 
sp.1, first spinal nerve 
sp.2, second spinal nerve 
sq., 0S SqUamosum 
st., stapes=columella 
tbs., tractus tecto-bulbaris et spinalis . 
th., thymus gland 
thl., thalamencephalon=interbrain 
tm., m. temporalis and nerve branches 
innervating it 
tmv., m. temporalis, inner ventral por- 
tion, with origin on orbitosphenoid 
tmo., roof of medulla oblongata 
to., tectum opticum 
trap., m. trapezius and nerve inner- 
vating it 
tr.co., truncus infraorbitalis 
trm., muscles of the trunk 
tro., tractus opticus 
tr.so., truncus supraorbitalis 
tso., tectum synoticum 
vp., vomero-palatine 
teeth 
I., nervus olfactorius 
Ia. division of n. olf. from anterior 
rootlets 
ossicles with 
