114 
/LEAST PETREL. 
ridges. The tongue is 5i twelfths long, emarginate and serrulate at the 
base, very much flattened, tapering to a horny point. The heart, Fig. 1, a, 
is of a very elongated narrow conical form, 2 twelfths in length, 4 twelfths 
in breadth at the base. The lobes of the liver, b c, are equal, twelfths 
long. The oesophagus, d e, is 1 inch 10 twelfths long, of a uniform diameter 
of 2 \ twelfths ; behind the liver, it enters as it were a large sac, jf g- h, 9 
twelfths of an inch long, which gradually expands to a diameter of 6 
twelfths, forming a broad rounded fundus g, then curves forwards on the 
right side, and at h terminates in a small gizzard, about 3 twelfths long, and 
nearly of the same breadth, from the left side of which comes off the 
intestine. The latter passes forward, curving to the right, behind and in 
contact with the posterior surfaces of the liver, then forms the duodenal 
fold, h j Ic, in the usual manner. The intestine, on arriving at the right 
lobe of the liver, at k, receives the biliary duct, curves backward beneath 
the kidneys, and forms several convolutions, which terminate above the 
proventriculus. It then becomes much narrower, and passes directly back- 
ward, in a straight course to the rectum, which is only 4 twelfths of an inch 
long. The coeca are oblong, li twelfths in length, and i twelfth in diameter. 
The intestine is 81 inches long, its diameter diminishing gradually from 2 
twelfths to £ of a twelfth. 
In Fig. 2 are represented the lower part of the oesophagus, d e/; the 
proventricular sac ,fg h; the very small gizzard, hj the duodenal fold of 
the intestine, ij k. Here the parts are viewed from the left side. 
