124 
Dr. Kidd on the 
of the same colour, running from the top to the bottom ; of 
which those of the middle series are twice as broad and 
more complicated in form than those of the lateral series. 
As there are fifteen teeth in each of the three series of the 
six divisions, the gizzard contains in the whole 270 teeth.* 
In separating the muscular coat of the gizzard from that 
I 
which lines it, which may be easily done by maceration, the 
exterior surface of the glandular coat in which the teeth are 
inserted is exposed to view. The appearance of this surface 
is very singular, and may be compared to a piece of fine 
lace- work, of which the meshes represent the intervals of the 
inserted teeth, the parts of the membrane in which the roots 
of the teeth are inserted resembling the lace- work itself. 
Four of the divisions above described are elongated so as 
to terminate in a tapering membranous appendage, consisting 
of a natural fold, which serves to convey onwards any fluid 
particles that may have been pressed out by the action of the 
gizzard ; and these four appendages so collapse together as 
to form a point, as it were, which lies immediately in contact 
with the commencement of the common intestines. This 
apparatus is only discoverable by dissection ; for it is con- 
tained in a large membranous cavity of the shape of a horse- 
shoe, the base of which passes across the lower extremity of 
the gizzard, while the sides form two enormous cseca, which 
ascend obliquely outwards on each side of the gizzard. 
As the muscular compression of the gizzard must neces- 
sarily have a tendency to force a part of any expressed 
fluid back into the esophagus, we may expect this organ to 
be so constructed as to prevent such an effect ; and it is pro- 
• Vide fig. 6 , 7, 8. 
