LEAST PETREL. 



231 



ridges. The tongue is 5^- 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, 6i twelfths 

 long. The oesophagus, d e, is 1 inch 10 twelfths long, of a uniform diameter 

 of 2jf twelfths; behind the liver, it enters as it were a large sac, f 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 k, 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 cceca are oblong, li twelfths in length, and \ twelfth in diameter. 

 The intestine is 8j inches long, its diameter diminishing gradually from 2 

 twelfths to § of a twelfth. 



Fig- 2- 



Fig. 3. 

 1^ 



In Fig. 2 are represented: — the lower part of the oesophagus, d e f; the 

 proventricular sac, f g h; the very small gizzard, A; the duodenal fold of 

 the intestine, ij k. Here the parts are viewed from the left side. 



