original description
(of Helix (Pella) tuguriolum Melvill & Ponsonby, 1892) Melvill, J. C. & Ponsonby, J. H. (1892). Descriptions of seventeen new terrestrial mollusks from South or Central Africa, in the collection of EDGAR L. LAYARD, Esq. <em>The Annals and Magazine of Natural History.</em> (6) 9 (49): 87-94, pl. 4-6. London. [1 January]., available online at https://www.biodiversitylibrary.org/page/15617730
page(s): 88 [details]
original description
(of Helix tollini W. H. Benson, 1856) Benson, W. H. (1856). New land snails collected by E.L. Layard, Esq. <em>Annals and Magazine of Natural History.</em> (2) 18(108): 433–439., available online at https://www.biodiversitylibrary.org/page/18685542#page/447/mode/1up
page(s): 436-437 [details]
original description
(of Nanina afra L. Pfeiffer, 1855) Pfeiffer, L. (1855-1856). Versuch einer Anordnung der Heliceen nach natürlichen Gruppen. <em>Malakozoologische Blätter.</em> 2(3): 112 [≥ September 1855]; 2(4): 113–144 [December 1855]; 2(5) (“1855”): 145–185 [January 1856]., available online at https://www.biodiversitylibrary.org/page/15864853
page(s): 119 [details]
original description
(of Helix tollini Albers, 1857) Albers, J. C. (1857). Diagnosen neuer Heliceen mit gelegentlicher Berichtigung einiger älteren Arten. <em>Malakozoologische Blätter.</em> 4(5): 89-100, pl. 1-2. Cassel [May]., available online at https://www.biodiversitylibrary.org/page/15865334
page(s): 94 [details]
original description
(of Helix afra L. Pfeiffer, 1859) Pfeiffer, L. (1859). Monographia Heliceorum viventium. Sistens descriptiones systematicas et criticas omnium huius familiae generum et specierum hodie cognitarum. Volumen quartum. (1): 1–352 [January or February]; (2): 353–920, i–ix [< November]. Lipsiae: F.A. Brockhaus., available online at https://www.biodiversitylibrary.org/page/11648889
page(s): 124. [details]
additional source
Connolly, M. (1939). A monographic survey of South African non-marine Mollusca. <em>Annals of the South African Museum.</em> 33: 1-660.
page(s): 189 [details] Available for editors [request]
additional source
Preece, R. C., White, T. S., Raheem, D. C., Ketchum, H., Ablett, J., Taylor, H., Webb, K. & Naggs, F. (2022). William Benson and the golden age of malacology in British India: Biography, illustrated catalogue and evaluation of his molluscan types. <em>Tropical Natural History.</em> No. 6: Supplement: 1-434., available online at https://li01.tci-thaijo.org/index.php/tnh/article/view/257073/175390
page(s): 138, Fig. 60 E [details] Available for editors [request]
From editor or global species database