PY: 
par. 
pn 
pnw. 
p.0e. 
pee. 
P-pg- 
Pp: 
ppe. 
te 
pro. 
ps. 
pS. 
Ry« 
770.0. 
S.Ct. 
s.mf. 
Sn. 
SO. 
S.pd. 
Sp.S. 
Fig. 1 
Fig. 2. 
Fig. 3 
Fig. 4 
Fig. 5 
Fig. 6 
Fig. 7. 
Fig. 8. 
Fig. 1 
OG) bo 
DEVELOPMENT 
pterygoid. 
processus gracilis. 
prenasal cartilage. 
posterior nasal wall. 
paroccipital. 
posterior palatine foramen. 
palato-pterygoid. 
palatine floor of palatine. 
palatal part of premaxillary. 
promontory. 
prootic. 
presphenoid. 
posterior semicircular canal. 
pituitary body. 
recurrent cartilages. 
short crus of incus. 
stylo-mastoid foramen. 
septum nasi. 
supero-occipital. 
soft palate. 
sphenoidal sinus. 
. squamosal. 
. sella turcica. 
. Stapes. 
stylohyal. 
stapedius muscle. 
OF THE SKULL IN THE PIG. 
t.C. 
t.ch. 
tf. 
ty. 
th.h. 
tp. 
Aes 
trem. 
t.ty. 
ty. 
ul. 
u.th. 
tympanic cayity. 
tentorium cerebelli. 
temporal fossa. 
tongue. 
thyrohyal. 
tooth-pulp. 
trabecula. 
trabecular commissure. 
tegmen tympani. 
tympanic. 
upper lip. 
upper turbinal. 
- vomer. 
vestibule. 
zygomatic process of maxillary. 
zygomatic process of squamosal. 
. olfactory nerve. 
. optic nerve. 
. ophthalmic nerve. 
5°’, main part of 5th nerve. 
. portio dura. 
7”. chorda tympani. 
. portio mollis, 
. glossopharyngeal. 
. vagus. 
9. hypoglossal. 
DESCRIPTION OF THE PLATES. 
PLATE XXVIII. 
First Stage —Embryo Pig, 3 inch in length. 
diameters. 
. A vertical section of the head. 
x 
< 7 diameters. 
. A plan of the skull and face, seen from below. 
x 10 diameters. 
. Side view of upper part of embryo. x 7 diameters. 
A plan of the same, with facial arches. 
. A front view of the same. 
. A palatal view of the same, with the mandible and lower face removed. x 15 
7 diameters. 
x 10 diameters. 
Part of the same, with median part of nasal region removed. X 20 diameters. 
Upper view of a horizontal section of the head. 
x 10 diameters. 
PLATE XXIX. 
. Another section through the 
. Transversely vertical section of the nose, in front. 
1 
< 12 diameters. 
. A similar section through the middle of the nasal region. X 12 diameters. 
posterior nasal region. Xx 12 diameters. 
