90 Transactions oj the Boyal Society of South Africa. 
is at present unknown. They are capable of expansion and contraction. 
Their position is generally in the posterior part of the body, and ventrally 
lying over and between the intestines. 
In the common Transvaal Ohamaeleon, Ch. quilensis, these peculiar 
structures are also very well developed as posterior and ventral diverticula 
of some considerable length (vide Text-fig. 1). The figure is based on the 
lung of a fresh individual drawn in situ ; the general position of the out- 
growths has been delineated as in life. However, a good length of each 
sac must be imagined as tucked away and twisted between the intestines. 
Mr. Beddard has given a figure of the lung of Gh. dilepis with very 
short diverticula. Though we have examined several specimens of this 
species we have found the sacs to be short only when much contracted. 
Indeed, we have been quite unable to detect any difference between the 
lungs of dilepis and those of quilensis, though Beddard, who had much 
less material at his disposal, regarded them as essentially different, This 
is a point of some importance, seeing that some authorities, including 
Boulenger, regard dilepis and quilensis as distinct species, whilst Tornier 
and Werner believe them to be merely forms of the same species. We 
are in favour of the latter view. 
In South Africa the genus Chainaeleon, as defined by Boulenger, is 
represented by about nine species, which, according to their external 
characters, are arranged into three sections : (1) that of dilepis and its 
variety quilensis, (2) that of namaquensis, and (3) the pumilus section 
which includes all the species so characteristic of southern and eastern 
Cape Colony with outliers in Natal and the Transvaal. Of namaquensis 
we have been able to examine two specimens. The lungs were found to 
have several long diverticula distally and ventrally, but they were not so 
numerous as in dilepis. \Ng may add that namaquensis shows a further 
Text-Fig. 1. — Left Lung of C. quilensis. 
