Sowerby, G. B. II. (1868). Monograph of the genus Bulla. In: Conchologia iconica, or illustrations of the shells of molluscous animals, vol. 16: pls. 1-6 and unpaginated text. L. A. Reeve, London. [stated dates: pls. 2-4, Jan. 1868; 1, 5, 6, Mar. 1868].
437000
Sowerby, G. B. II
1868
Monograph of the genus <i>Bulla</i>. In: <i>Conchologia iconica, or illustrations of the shells of molluscous animals</i>, vol. 16: pls. 1-6 and unpaginated text. L. A. Reeve, London. [stated dates: pls. 2-4, Jan. 1868; 1, 5, 6, Mar. 1868]
vol. 16, pl. 1-6 and unpaginated text. L. Reeve & Co., London. [stated dates: pl. 1, 5-6, March 1868; pl. 2-4, January 1868]