organs of respiration in animals. 
263 
Plate XII. 
The respiratory organs in an animal from the South Seas, 
and in the myxine. 
Fig. 1. These organs exposed in the animal from the 
South Seas. 
a. The external nostril. 
b. Internal nostril. 
c. A tooth on the roof of the mouth. 
dd. The tongue split, showing two rows of teeth on each 
side. 
ee. The muscles of the tongue divided and turned aside. 
ff. The oesophagus. 
gg. The external openings into the respiratory organs. 
hh. The internal ones, 
ii. The organs themselves. 
Fig. 2. One of the bags or organs laid open. 
Fig. 3. The same parts in the myxine. 
a. The external nostril. 
b. The internal nostril. 
c. A tooth in the roof of the mouth. 
dd. The tongue split, showing two rows of teeth on each 
side. 
ee. The muscles of the tongue turned aside. 
ff. The oesophagus. 
g. The stomach. 
hh. The two external openings leading to the organs. 
i. The opening leading to the oesophagus. 
kk. The tubes leading to the organs. 
//. The internal openings. 
