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- Layard EL (1853) Rambles in Ceylon. The Annals and Magazine of Natural History 61: 224–236. [Mention of a leech with a half-moon-shaped tail (p. 225), which is likely a bipaliid land planarian].
- Leidy J (1851) Helminthological contributions. No. 3. Proceedings of the Academy of Natural Sciences of Philadelphia 5: 239–244.
- Leidy J (1851) Corrections and additions to former papers on Helminthology published in the Proceedings of the Academy. Proceedings of the Academy of Natural Sciences of Philadelphia 5: 284–290.
- Leidy J (1858) Remarks on Rhynchodemus sylvaticus. Proceedings of the Academy of Natural Sciences of Philadelphia 9: 171–172.
- Schmarda LK (1858) Neue Wirbellose Thiere beobachtet und gesammelt auf einer Reise um die Erde 1853 bis 1857 1. Turbellarien, Rotatorien und Anneliden. Erste Hälfte. Volume 1. Wilhelm Engelmann, Leipzig. [in German]
- Schultze M, Müller F (1857) Beiträge zur Kenntnis der Landplanarien. Abhandlungen der Naturforschenden Gesellschaft zu Halle 4: 61–74. [in German]
- Schultze M, Müller F (1857) Contributions to the knowledge of the terrestrial Planariae from communications from Dr. Fritz Müller of Brazil and personal investigations. The Annals and Magazine of Natural History 115: 1–15. [translation in English]
- Stimpson W (1857) Prodromus descriptionis animalium evertebratorum quæ in Expeditione ad Oceanum, Pacificum Septentrionalem a Republica Federata missa, Johanne Rodgers Duce, observavit er descripsit. Pars I. Turbellaria Dendrocœla. Proceedings of the Academy of Natural Sciences of Philadelphia 9: 19–31. [in Latin]
- Tennent JE (1860) Ceylon : an account of the island, physical, historical, and topographical with notices of its natural history, antiquities and productions. Vol. I. Longman, Green, Longman, and Roberts, London. 643 pp.
- Wright EC (1860) Notes on Dunlopea. Annals and Magazine of Natural History, 3rd ser. 6: 54–56.
Earthling Nature 