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the rest of the gullet. The gastric folHcles are simple, elongated 

 and rather flattened. The gizzard is small and weak in its parietes, 

 resembling that of the Toucan. Its length is 1 inch 4 lines; its 

 greatest diameter 10 lines. The lateral tendons are distinct, and 

 the narrower portion beyond xhe pylorus has the strongest muscu- 

 lar coat, which, however, does not exceed at this part ;rd of a line 

 in thickness. 



" The capacity of a gizzard of this structure is obviously one 

 reason why a crop or reservoir is not required : where the muscu- 

 lar parietes encroach upon the digestive cavity, so as only to allow 

 small portions of food to enter at a time for the purpose of under- 

 going trituration, then a crop is as necessary to the gizzard as the 

 hopper to a mill. It is also required in some of the most carni- 

 vorous birds to enable them to glut themselves with portions of 

 their prey when too bulky to be borne away entire, and thus to 

 carry off more than the true digestive cavity can contain. But in 

 birds which, like the Toucans, the HornbiUs, the Parrots, and the 

 Touracos, live amidst abundance of nutriment, and that of easy 

 digestion, a superadded cavity to act as a reservoir, or to submit the 

 food to maceration previous to its entering upon the digestive pro- 

 cess, appears unnecessary. 



" The intestinal canal in the Touraco has a similar affinity to that 

 of the tribes of Birds above mentioned, being short, ample and 

 without co'ca. It measured twice the length of the bird from the 

 end of the bill to the vent. A small pyloric canal intervenes between 

 the gizzard and duodenum, and opens into the latter upon a valvular 

 prominence. The duodenum suddenly dilates, and has a diameter 

 of half an inch; but I am doubtful whether this is natural, as it 

 was, in the present instance, distended with Tcenice, which had per- 

 forated it in some places, and probably caused the death of the bird. 

 The fold of the duodenum is 3 inches long, including a narrow bi- 

 \ohedi jMncreas. The intestine gradually diminishes in diameter to 

 within 5 inches of the cloaca, when it suddenly dilates, and this 

 portion has the usual disposition and course of the rectum in birds. 



" The liver was composed, as usual, of two lobes. There was a 

 gall-bladder, of an elongated form, with the cystic duct continued 

 from the end furthest from tlie intestine. The mode of termination 

 of the biliary and pancreatic ducts I was unable to determine, owing 

 to the morbid adhesions caused by the irritation of the Tcenice. 



" The testes were small. The kidneys and supra-renal glands 

 were of the usual structure. 



'< From the affinity pointed out by Cuvier between the Touraco 

 and the Curnssoivs, I examined carefully the structure of the trachea, 

 so remarkable for its convolutions in the latter family of birds. It 

 was, however, continued straight to the inferior larynx, and was 

 connected to the yurculmn only by a slight aponeurosis: the 

 sterno-tracheal muscles, a single pair, were strong in proportion to 

 the size of the bird. The rings of the irochea were of a flattened 

 form, gradually diminishing in size towards the lower extremity of 

 the tube. The lungs were of the usual form and structure, and the 



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