J. S.  Gardiner, ?Madreporaria. I. Introduction with notes on variation. II. Astraeidae. With plates LIX-LXIV?, in The Fauna and Geography of the Maldive and Laccadive Archipelagoes: Being the Account of the Work Carried on and of the Collections Made by an Expedition During the Years 1899 and 1900, vol. 2, J. S.  Gardiner, Ed. Cambridge: Cambridge University Press, 1904, pp. 755?790.