xii ERRATUM 



confusion. A review of the species is urgently needed. To this end I am accumulating 



material, and I shall be very grateful for any representative specimens from different 



parts of India, Ceylon, Burma, and the Persian Gulf that anyone in a position to help 



may be kind enough to send. Not less than half a dozen shells should be sent from 



each locality and these should comprise as great a variety of form as possible. The 



tjrpical or most common form assumed in each locality should be distinctively indicated, 



wherever possible. 



J. HORNELL. 



