OSSICTJLA AUDITUS IN THE HIGHER MAMMALIA. 
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m.br. 
Mid brain. 
Mx. 
Maxillary arch. 
Mn. 
Mandibular arch. 
mn.pv. 
Mandibular process. 
op. 
Optic. 
olf.p. 
Olfactory pit. 
OG.C. 
Occipital cartilage. 
or.ap. 
Orbicular apophysis of the incus. 
olf.n. 
Olfactory nerve. 
pex. 
Periotic capsule. 
p.s.ca. 
Posterior semicircular canal. 
pe.pr. 
Periotic process. 
p.v.au. 
Vestibular portion of auditory 
nerve. 
px.au. 
Cochlear portion of auditory 
nerve. 
p.pr. 
Posterior process. 
pe. 
Periotic. 
pxust. Eustachian portion of bulla. 
pt.i. 
Pterygoideus internus. 
pt.c. 
Pterygoid cartilage. 
T.V. 
Recessus vestibuli. 
rxe. 
Recessus cerebelli. 
s.ty. 
Sulcus tympanicus. 
s.s.ca. 
Superior semicircular canal. 
st. 
Stapes. 
s.hem. 
Sacculus hemisphericus. 
st. a.c. 
Anterior crus of stapes. 
st.m. 
Stapedius muscle. 
s. p.s.c«.United portion of superior and 
posterior semicircular canals. 
th.hy.c. Thyro-hyoid cartilage (cartilage 
of first branchial arch). 
t. ty. Tensor tympani. 
ty.a. Tympanic annulus. 
th.c. Thyroid cartilage. 
t.p. Tubal portion of sulcus tubo- 
tympanicus. 
tub. Tubercle on posterior crus of 
stapes for stapedius muscle. 
th. Vesicle of the third ventricle. 
v.j.pv. Vena jugularis primitiva. 
v.j. V ena j ugularis. 
v.c. Vertebra cervicalis. 
ve. Vestibule. 
v.j.ex. Vena jugularis externa. 
V I . Ophthalmic branch of fifth nerve. 
V 2 . Maxillary branch of the fifth. 
y\ib. Mandibular branch of fifth (in¬ 
ternal division). 
V 3 .eA. Mandibular branch of fifth (ex¬ 
ternal division). 
VII. Seventh (nervus facialis). 
VIII. Auditory. 
IX. Glossopharyngeal. 
X. Pneumogastric. 
XI. Spinal accessory. 
XII. Hypoglossal. 
6 b 
MDCCCLXXXII, 
