1. A bibliography of descriptive and comparative echinoderm embryology up to the year 1920 will be found in Studies of the development and larval forms of echinoderms by Th. Mortensen, Copenhagen (1921).
2. Early development and metamorphosis of the tropical echinoid Salmacis bicolor Agassiz;Aiyar;Proc. Ind. Acad. Set.,1935
3. Echinoderm larvae and their bearing on classification;Bather;Nature, Lond.,1923
4. Eogenesis-The origin of animal forms;Clark;Acta Biotheoretica,1937
5. de Beer, G. R. (1930). Embryology and evolution. Oxford.