L to R: Limax faba from Thomas Martyn (1784: pl. 67, middle two figures, of four, edited just for juxtaposition), Partula inflata and P. rubescens from Lovell Augustus Reeve (1850: plate 1, fig 4a; plate 3, fig. 12 respectively), P. stenostoma and P. suturalis from Ludwig (Louis) Pfeiffer (1856: pl. 17, figs. 17, 18 respectively).

Dall, W.H., 1906. Thomas Martyn and the Universal Conchologist. Proceedings of the United States National Museum 29: 415-432.
Dall, W.H., 1908. Supplementary noted on Martyn's Universal Conchologist. Proceedings of the United States National Museum 33: 185-192.
Johnson, R.I., 1969. Pfeiffer’s Novitates Conchologicae, Series I, Land Mollusca, 1854–1879, and Dunker’s Novitates Conchologicae, Series II, Marine Mollusca, 1862–1882. A complete collation. Journal of the Society for the Bibliography of Natural History 5(3): 236–239. October.
Martyn, T., 1784-87. The universal conchologist, exhibiting the figure of every known shell... drawn... and painted... with a new systematic arrangement, etc. 4 vols. Martyn, London. 27 pp., 161 pls. [collation per Dall, 1906, 1908]. A French-English edition with all the 80 plates of the original volumes 1 and 2 (1784), and from which the above images are taken, is posted on-line at <http://lib.s.kaiyodai.ac.jp/library/digital/Martyn.htm>
Pfeiffer L., 1854-1860. Novitates Conchologicae. Series Prima. Mollusca Extramarina Beschreibung und Abbildung neuer oder kritischer Land-und Süsswasser-Mollusken 1. Theodor Fischer, Cassel. 1-138 pp + pls. 1-36 [issued in twelve parts 1854 to May, 1860; [full collation by Johnson, 1969]
Pilsbry, H.A., 1908-10. Manual of Conchology (second series). 20. Caecilioides, Glessula, Partulidae; index to volumes 16-20. Academy of Natural Sciences, Philadelphia. vii i+ 1-336 + 43 pls. Nov. 19 to Feb.
Reeve, L.A., 1850 Monograph of the genus Partula. Conchologia Iconica 6: 9 pp, 4 pls. May.