Tryon, G. W. & Pilsbry, H. A. (1888-1889). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 4: Helicidae, vol. 2. pp 1-296, pls 1-69. Philadelphia, published by the author. [pp. 1-64, pls 1-14, Mar. 16, 1888; pp. 65-120, pls 15, 16, Jul. 1, 1888; pp. 121-128, pls 17-32, Jul. 1, 1888; pp. 129-192, pls 33-44, Oct. 1, 1888; pp. 193-296, pls 45-69, Jan. 3, 1889].
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Tryon, G. W. & Pilsbry, H. A.
1888-1889
<i>Manual of conchology, structural and systematic, with illustrations of the species</i>. Ser. 2, Pulmonata. Vol. 4: Helicidae, vol. 2. pp 1-296, pls 1-69. Philadelphia, published by the author. [pp. 1-64, pls 1-14, Mar. 16, 1888; pp. 65-120, pls 15, 16, Jul. 1, 1888; pp. 121-128, pls 17-32, Jul. 1, 1888; pp. 129-192, pls 33-44, Oct. 1, 1888; pp. 193-296, pls 45-69, Jan. 3, 1889]