ANATOMY OE B AL2EN OPTEEA BOSTEATA. 
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Fig. 9. Glottis open with the lips retracted. Similar references. 
Fig. 10. Tympanic bone with malleus, incus, and stapes attached in situ. 
Fig. 11. Periotic hone, lower surface. 
a. The wall of the labyrinth. 
b. Foramen ovale. 
c. Pedicles by which the tympanic bone was attached. 
d. Opisthotic portion. 
e. Prootic portion. 
PLATE VII. 
Fig. 1. Cranium viewed from above, showing superficial anatomy of the blowholes. 
A. Foramen magnum. 
B. Occipital bone. 
C, C. Temporal fossse. 
I). External nares. 
E. Median sulcus. 
F. Retractores naris. 
G. Dilator naris. 
H. Superior maxillary bone. 
I. Primordial vomer. 
J. Constrictor naris. 
Fig. 2. Anatomy of the deep structures of the blowholes as viewed from above. 
The letters D, E, F, L, J, K refer to same parts as in fig. 1. 
Fig. 3. Deep structures of blowholes as viewed from below. 
A. Cavity of naris. 
B. Black epithelial layer of mu- 
cous membrane. 
C. Alar fibrocartilages. 
Fig. 4. Stomach and liver. Front view. 
A. (Esophagus. 
B. First stomach. 
C. Second stomach. 
D. Third stomach. 
E. Fourth stomach. 
D. Deep dilator of the nares. 
E. Median crest. 
F. I, J refer to same parts as in 
fig. 1. 
F. Fifth stomach. 
G. Duodenum. 
H. Liver. 
I. Lesser omentum. 
J. Spleen. 
Fig. 5. Stomach, and outline of liver, back view. 
Letters A to G refer to same parts as in fig. 4. 
Fig. 6. Tympanic bone, upper surface with the ossicles attached. 
