@article {1790,
	title = {Brief descriptions of several terrestrial planariae and of some remarkable marine species, with an account of their habits},
	journal = {The Annals and magazine of natural history; zoology, botany, and geology being a continuation of the Annals combined with Loudon and Charlesworth{\textquoteright}s Magazine of Natural History},
	volume = {14},
	year = {1844},
	pages = {241-251},
	url = {http://www.biodiversitylibrary.org/item/19582$\#$page/267/mode/1up},
	author = {Charles Darwin}
}
