Sowerby, G. B. II. (1865-1866). Monograph of the genus Vertagus. In: Conchologia Iconica, or, illustrations of the shells of molluscous animals, vol. 15, pls 1-5 and unpaginated text. L. Reeve & Co., London [stated dates: pl. 1, 3, 5, March 1866; pl. 2, December 1865; pl. 4, March 1865].
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Sowerby, G. B. II
1865-1866
Monograph of the genus <i>Vertagus</i>. In: <i>Conchologia Iconica, or, illustrations of the shells of molluscous animals</i>, vol. 15, pls 1-5 and unpaginated text. L. Reeve & Co., London [stated dates: pl. 1, 3, 5, March 1866; pl. 2, December 1865; pl. 4, March 1865]