452 Journal of the Asiatic Society of Bengal. [N.S., XIV, 1918.] 
demonstrate that its present occurrences are the shrunken 
remnants of a once much wider range, and do not supply the 
slightest indication as to whether its original home was 
situated in Australia or in Arabia, or in some totally different 
region. 
The other instances of southern species occurring as 
fossils in the Tertiary of India, lack the confirmation which 
the local survival of the species affords in the case of Dolium 
variegatum. Nevertheless, keeping this instance in mind, they 
o not at all imply the necessity of any migration from India 
to the southern seas, but may merely indicate the dwindling, 
in recent times, of a once much wider area of distribution. 
much slower process than its expansion subsequent to its 
original creation. 
NRO LL OO, 
