Sowerby, G. B. II. (1873-1874). Monograph of the genus Physa. In: Conchologia iconica, or illustrations of the shells of molluscous animals, vol. 19, pls 1-12 and unpaginated text. L. Reeve, London. [publication dates: pls. 2-7, Feb. 1873; 8-10, Apr. 1873; 1, 11, 12, Nov. 1874].
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Sowerby, G. B. II
1873-1874
Monograph of the genus <i>Physa</i>. In: <i>Conchologia iconica, or illustrations of the shells of molluscous animals</i>, vol. 19, pls 1-12 and unpaginated text. L. Reeve, London. [publication dates: pls. 2-7, Feb. 1873; 8-10, Apr. 1873; 1, 11, 12, Nov. 1874]