MolluscaBase taxon details
original description
(of Helix (Allognathus) Pilsbry, 1888) 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]. , available online at https://www.biodiversitylibrary.org/page/1103301
page(s): 121 [details]