Beddard, F.E. (1891). On the structure of an earthworm allied to Nemertodrilus, Mich., with observations on the post-embryonic Development of certain organs. Quarterly journal of microscopical science. 32(128): 539-586 + Plates XXXVIII-XXXIX.
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Beddard, F.E.
1891
On the structure of an earthworm allied to Nemertodrilus, Mich., with observations on the post-embryonic Development of certain organs