46 



MR. F. E. BEDDARD ON THK ANATOMY 



[Jan. 15, 



which the more dorsal extends headwaixls of the orifice of the 

 bronchus. This statement at any rate holds good for the majority 

 of the IguanidsB that have been examined. ChamceleoUs does not 

 agree with these types, for the lung is not divided by an obliquely 

 placed septum into two approximately parallel chambers. It is, 

 nevertheless, not to be removed from the Igvianidse on this 

 account, since it appears to present points of likeness to the 

 undoubtedly Squamoid Phrynosoma, and one point at least of 

 resemblance to the Iguanoid genus Folychrus. 



Text-fig. 13. 



Lung of ChamceleoUs, opened longitudinally. 



The bronchus enters for a shoit distance into the lung as a 

 completely circular tube ; there is no snake-like series of flattened 

 semirings such as is to be found in Iguana*'. The projecting 

 bronchus is, as in Phrynosoma, moored to the walls of the lung by 

 septa. The cavity of the lung, therefore, extends headwards of 

 the opening of the bronchus and all round it. Thei'O is no septum 

 in either lung which separates off the dorsally placed caecum of the 

 lung as a distinct cavity from the rest of the cavity of the organ. 

 In the ]eft lung the structure happened to be more favourable for 

 observation than the right liing, and I have accordingly had a 

 drawing prepared (text-fig. 13) of the interior of this lung. It 



* Milaui, loc. cif. pi. xxxi. fig. 13. 



