Godwin-Austen, H. H. (1881). On the land-shells of the Island of Socotra collected by Prof. Bayley Balfour. Part II. Helicaceae. Proceedings of the Zoological Society of London. 49(4): 801-812, pls 68-69. London [April].
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Godwin-Austen, H. H.
1881
On the land-shells of the Island of Socotra collected by Prof. Bayley Balfour. Part II. Helicaceae