THE ALIMENTARY SYSTEM, 207 
the tongue, supported by its ‘os hyoides” *, and behind the 
tongue is an opening, called the glottis, which leads into the 
windpipe and so into the lungs. 
Into the base and sides of the mouth open the spittle-glands 
or salivary glands, which are usually small and simple, but may, 
as in the Woodpecker, be considerably developed. 
Fig. 161, 

ViscprA OF THE Fow., 
e, (Esophagus; cp, crop; pe, proventriculus ; g, gizzard ; /, liver; gb, gall- 
bladder ; p, pancreas; d, loop of the duodenal part of the intestine 
enclosing the pancreas; sz, small intestine; /, large intestine ; c, cxea ; 
o, oviduct ; w, ureter.—The cloaca is cut open, and some feathers are 
represented as attached to its margin. 
The tongue may be of large size, and soft as in the Parrot ; it 
way be a horny spine, as in the Woodpecker. It may form 
two delicate tubes, side by side, as in the Humming-bird ; it 
* See ante, p. 187. 
