DEVELOPMENT OF THE SKULL OF THE COMMON FltOG. 
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o.s. orbito-sphenoid. 
ot. otoliths, or otoconia. 
p. parietal. 
pa. palatal. 
pa.s. parasphenoid. 
p.b.c.f. posterior basicranial fontanelle. 
p.br. pharyngo-branchial. 
p.c.cl. pericardium. 
p.e. perpendicular ethmoid. 
p.fo. posterior fontanelle. 
p.g. pterygoid. 
pg.p. pterygo-palatine. 
pi ix. pharynx. 
p.mx. premaxillary. 
p.op. prseoperculum. 
p.p.p. pterygo-palatal process. 
p.p.x. palatal process of premaxillary. 
pr.f. prefrontal. 
pr.Tim. prehyomandibular. 
pr.m. promontory. * 
pro. prootic. 
pr.pa. prepalatal. 
p.s. presphenoid. 
p.sc. posterior semicircular canal. 
pt.o. pterotic. 
pt.hm. posthyomandibular. 
p.t.o. postorbital. 
pt.pa. postpalatal. 
py. pituitary space. 
rp quadrate. 
r. rostrum of parasphenoid. 
s.c. simple cartilage. 
s.hm. suprahyomandibular. 
s.mx. septo-maxillary. 
s.n. septum nasi. 
sn.c. snout-cartilage. 
s.n.l. subnasal lamina. 
s.o.f. subocular fenestra. 
sp. suspensorium. 
s.st. suprastapedial. 
st. stapedial. 
s. t. supratemporal. 
st.f. stapedial fossa. 
st. li. stylo-hyal. 
su. s. suprasphenoidal. 
sy. symplectic. 
t. temporal bone. 
tg. tongue. 
th. thyro-hyal. 
tli.v. theca yertebralis. 
t. m. temporal muscle. 
tr. trabecula cranii. 
t.c. trabecular commissure. 
t.s.I. transcptal lamina. 
t. ty. tegmen tympani. 
u. d.g. upper dentigerous plate. 
u. 1. upper labial. 
vb. vestibule. 
v. e.n. valvular process of external nostril. 
v.i.n. valvular process of internal nostril. 
y- yelk. 
z.m.x. zygomatic process of maxillary. 
1. olfactory nerve. 
2. optic nerve. 
5. trigeminal nerve. 
7 a . portio-dura nerve. 
7 s . portio-mollis nerve. 
8". glosso-pharyngeal nerve. 
8 4 . vagus nerve. 
