EARED GREBE. 623 



neck form an immense dilatation ; that of the left side being distended 

 with coagulated blood to 9 twelfths of an inch, and so continuing until 

 it enters the heart. The other is | inch in breadth. In this respect 

 there seems to be an analogy to the diving mammifera, such as the 

 Seals and Dolphins. 



EARED GREBE. 



PODICEPS CORNUTUS, LiNN. 

 PLATE CCLIX. Vol. III. p. 429. 



Male. The mouth as in the last species, 4| twelfths wide ; the 

 tongue 11 twelfths long, and similar to that of the Red-necked Grebe. 

 (Esophagus 7 inches in length, along the neck only 4 twelfths broad ; 

 the proventriculus excessively large, ovate, 10 twelfths in breadth. The 

 stomach is an enormous sac, 2 inches long, 1| broad, a little compres- 

 sed, of the same structure as in the last species ; its tendons 4 twelfths 

 in breadth. There is a small flattened pyloric lobe. The contents of 

 the stomach are feathers, and bones of fishes. There is in this species 

 a very distinct, thick, soft, bright red, longitudinally rugous epithelium. 

 The proventricular glands are of great size, the largest 3 twelfths long, 



1 twelfth in breadth ; they form a belt 1^ inch in breadth. The lobes 

 of the liver are very large, the left 2 inches 4 twelfths long, the right 



2 inches ; the gall-bladder oblong. The intestine forming 12 curves ; 

 its length is 49 inches, its breadth at the upper part 5 twelfths, dimi- 

 nishing to 3 twelfths ; the coeca 2 inches long ; their greatest width 

 2 twelfths, their distance from the extremity 1 inch 9 twelfths. Cloaca 

 globtdar, about 7 twelfths in width. 



The trachea is 6j inches long, much flattened in its whole length, 

 excepting half an inch at the lower part ; for half its length, it is 

 2 twelfths in breadth, then enlarges to 3 twelfths, and finally diminishes 

 to I5 twelfth. The rings are 184, firm. The bronchi are slender, 

 with the rings complete, ossified, 12 in number : the remaining part 

 being membranous. The muscles as in the last. 



The jugular veins are not enlarged in this specie.s. 



