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Pillai, T. Gottfried. (1970). Studies on a collection of Spirorbids from Ceylon, together with a critical review and revision of Spirorbid systematics, and an account of their phylogeny and zoogeography. Ceylon Journal of Science (Biological Sciences). 8(2): 100-172.
Pillai, T. Gottfried. (1970). Studies on a collection of Spirorbids from Ceylon, together with a critical review and revision of Spirorbid systematics, and an account of their phylogeny and zoogeography. Ceylon Journal of Science (Biological Sciences). 8(2): 100-172.
