422 Journal of the Asiatic Society of Bengal. {[November, 1918. 
cavernicolous life. The question whether we are dealing here 
with two entirely different sets of phenomena, or merely wit 
cases in some of which an individual peculiarity has become 
hereditary, can hardly be discussed without a consideration of 
the possibility of the inheritance of acquired characters. And 
sufficient evidence is not forthcoming. 
In any case, there can be no danger in asserting that 
no species found in the caves of Burma and the Malay Penin- 
first. to consider another, to wit, What cavernicolous forms 
are most highly specialized in the palaearctic zone? Many of 
from the light of day; these chambers and the passages that 
lead to and from them contain streams and lakes on which 
necessarily correlated, the former has undoubtedly played a 
very Important part in the production of the peculiarities of 
faunas such as that of the Mammoth Cave 
the similarit 
fauna of the countries we are considering is that involved in 
or m les t , 
separated localities, but not, apparently, at any intermediate 
