of the Solvent Glands s Cdc. 
4°3 
EXPLANATION OF THE PLATES. 
Plate XI. 
The gizzard of the Soland goose laid open to show the situa- 
tion and appearance of the solvent glands. The engraving is 
of the natural size. 
Plate XII. 
Shows the form and internal structure of the cardiac cavity 
and gizzard in the wood-pecker, the sea-gull, and the little 
auk, all of the natural size. 
Fig. 1. The external appearance of the cardiac cavity and 
gizzard in the wood-pecker. 
a. The internal appearance of the cardiac cavity and gizzard 
of the wood-pecker. 
3. The internal appearance of the cardiac cavity and the 
cavity of the gizzard in the sea-gull. 
4. The internal appearance of the cardiac cavity and gizzard 
of the little auk. 
Plate XIII. 
Two views of the digestive organs of the parrot of the na- 
tural size. 
Fig. 1. An external view of the crop, cardiac cavity, and 
gizzard. 
2. An internal view of the same parts. 
Plate XIV. 
An external view of the cardiac cavity and gizzard of the 
American ostrich, one-fourth of the natural size. 
