the ręst of the gullet. The gastric follicles are simple, elongated 

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

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

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

 the narrower portion beyond the pyloms has the strongest muscu- 

 lar coat, which, however, does not exceed at this part jrd 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 : vvhere the muscu- 

 lar parietės 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. lt is also reąuired 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 avvay entire, and thus to 

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

 birds vvhich, likę the Tnucans, the Hornbills, the Parrots, and the 

 Toitracos, 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 asimilar affinity to that 

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

 without ccFca. It measured tvvice the length of the bird from the 

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

 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 1 am doubtful whether this is natūrai, as it 

 was, in the present instance, distended vvith 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- 

 \abed pancreas . The intestine gradualiy diminishes in diameter to 

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

 portion has tiie usual disposition and course of tlie rcctum in birds. 



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

 gall-biadder, of an elongated form, wiih the cystic duct continued 

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

 ofthebiliary and pancreatic ducts I was unable to determine, owing 

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



*' The tcstcs vvere small. The kidneys and supra-renal glands 

 were of the usual structure. 



" From the affinity pointed out by Cuvier betvveen the Touraco 

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

 .so remarkable for its convolutions in the latter faniily of birds. lt 

 was, however, continued straight to the inferinr lnrynx, and was 

 connected to \he Jurcidiim only by a slight aponeurosis : the 

 sterno-tracheal museles, a single pair, were slrong in proportion to 

 the size of the bird. The rings of tltt; trachea \vere of a flattened 

 forui, gradualiy diminitihing in sizo tovvards the lower extremity of 

 the lube. The lungs \vcre of the usual l'oim and structure, anil the 



