400 Mr. Home on the different Structure and Situations 
each of which communicates with five or six processes like the 
fingers of a glove. The structure is similar to that of the 
solvent glands of the beaver, among quadrupeds. 
The cardiac cavity, in which the solvent glands are situated, 
is dilated to a large size, as in the cassowary, and there is a 
similar muscular valve separating it from the gizzard. The 
digastric muscle is weak ; but the fibres of which it is com- 
posed, and the tendons between the two bellies of the muscle, 
are beautifully distinct. The appearance of these parts is shewn 
in the annexed drawing. 
In the African ostrich, (the Struthio Camelus,) the sol- 
vent glands are unusually numerous, similar in structure 
to those of the American species ; the space in which they 
are situated is not only dilated into a cavity, but is conti- 
nued down below the liver, and then bent up upon itself to- 
wards the right side, where it terminates in a strong gizzard 
nearly at the same height as the beginning of the cardiac 
cavity. 
This cardiac cavity of such unusual length and uncommon 
form is lined with a strong cuticle, except upon the left side 
where the solvent glands are placed, extending from the top 
to the bottom, and about four inches in breadth. 
The gizzard is unusually small ; the grinding surfaces do 
not admit of being separated to a great distance from one 
another, and on one side there are two grooves, and two 
corresponding ridges on the other. Beyond the cavity of the 
gizzard is an oval aperture with six ridges covered with cuticle 
to prevent any thing passing out of the gizzard till it is reduced 
to a small form. These appearances are shewn in the annexed 
drawing. 
