1909.] OF SNAKES OF THE GENUS BOA.. 919 



with that of the larger lung, which is represented in the drawing 

 exhibited herewith (text-fig. 281). The bronchial gutter of the 



Text-fig. 281. Text-fig. 282. 











Text-fig. 281. — Interior of anterior half of larger lung of Boa occidentalis, showing 

 bronchial gutter within lung. 



A. Orifice of bronchus of other lung. 



Text-fig. 282. — A portion of the larger lung of IBoa occidentalis immediately 

 following that illustrated in text-fig. 281. The end of the bronchial gutter 

 is shown and the " seam " continuous with it, which bifurcates distally. 



larger lung extends along that lung for fully seven inches, the dis- 

 proportion between the two lungs in this respect being therefore 



