Sowerby, G. B. II. (1876-1877). Monograph of the genus Cyrena. In: Conchologia iconica, or illustrations of the shells of molluscous animals, vol. 20, pl. 1-19 and unpaginated text. L. A. Reeve, London. [pls. 2-10, 1876, no month date; pls. 1, 11-19, 1877, no month date].
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Sowerby, G. B. II
1876-1877
Monograph of the genus <i>Cyrena</i>. In: <i>Conchologia iconica, or illustrations of the shells of molluscous animals</i>, vol. 20, pl. 1-19 and unpaginated text. L. A. Reeve, London. [pls. 2-10, 1876, no month date; pls. 1, 11-19, 1877, no month date]