Williams, Thomas. (1852). Report on the British Annelida. Report of the British Association for the Advancement of Science, 1851. 159-272. plates 2-11 [bound at end of volume].
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Williams, Thomas
1852
Report on the British Annelida
Report of the British Association for the Advancement of Science, 1851
World Polychaeta Database (WPolyD), Annelidabase. This work begins with a useful outline of the history of understanding of the Annelida group up to that time.