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EXPLANATION OF FIGURES. 
A.C. Auditory capsule. 1, cochlear, 
and 2, vestibular portion. 
A.S. Arteria stapedialis. 
Br. Barin. 
C.B. Crus breve incudis. 
C.I. Carotis interna. 
C.L. Crus longum incudis. 
Cli. T. Chorda tympani. 
E.A. External auditory meatus. 
G.F. Gill furrow. 
H. Hyoid cartilage. 
I. Incus. 
Ma. Malleus. 
M. Meckel’s cartilage. 
Ph. Pharynx. 
P.G. Processus gracilis. 
P.P. Pharyngeal pouch. 
S. Stapes. 
V.C.L. Vena capitis lateralis. 
Y. Eye. 
A. Auditory pit. 
Figs. 1, 2, and 3. Model of the auditory region of a five-weeks horse embryo 
(length 15 ’5 mm.), magnified 41 diameters. The auditory capsule and the ventral 
portion of the firs pharyngeal pouch are left incomplete. This model shows the 
mesenchyme areas, and not pro-cartilage or cartilage. 
Fig. 4. Model of the auditory ossicles of a horse embryo of seven weeks’ 
development (length 21 mm.), magnified 30 diameters. In this model the auditory 
ossicles only are shown complete. 
