66 



MR. F. E. BEDDARD ON THE ANATOMY 



[Jan. 15, 



or symmetry of the lungs and the windpipe as the case may be, 

 not, indeed, in point of length, which is a common feature among 

 Lizards and one of the most obvious features in which they 

 approach the Snakes. This asymmetry, when it occurs, affects 

 the position of the " eparterial bronchus" and the ventral forward 

 projection of the lung between the bronchi. In Varanus griseus 

 (text- fig. 19) the left lung, as well as the right lung, sends forward 

 towards the bifurcation of the bronchi a thin diverticulum, which 

 has an entire cavity not divided by any meshwork and seems to 

 be comparatively un vascular. This can readily be lifted up and is 

 seen to be not attached to the bronchus of the lung of which it 

 is an outgrowth. 



Text-fig. 19. 



Lvuigs of Varanus griseus. Details as in test-iig. 18. 



So far, therefore, the lungs are symmetrical. But the origin of 

 the eparterial bronchus is not symmetrical. On the right side 

 this branch arises from the bronchus at a distance of 27 mm. from 

 the point of bifurcation of the bronchi ; in the case of the left 



