An annotated type catalogue of seven genera of operculate land snails (Caenogastropoda, Cyclophoridae) in the Natural History Museum, London Author Sutcharit, Chirasak Author Ablett, Jonathan D. Author Panha, Somsak text ZooKeys 2019 842 1 65 http://dx.doi.org/10.3897/zookeys.842.29243 journal article http://dx.doi.org/10.3897/zookeys.842.29243 1313-2970-842-1 3A4BB2800F484831AF4BC84D6FE5CDAE 83. spiramentum Godwin-Austen, 1915 Fig. 11J Pterocyclos spiramentum Godwin-Austen, 1915: 498, 499, pl. 40, figs 4, 4a, 4b. Current generic position. Pterocyclos Benson, 1832 Type locality. Abor Hills [region in Arunachal Pradesh State, India]. Type material. Holotype NHMUK 1903.7.1.3082 (Fig. 11J). Remarks. The original description clearly stated that this taxon was described based on only one specimen. The NHM collections contain a lot consisting of a single specimen with a label in Godwin-Austen's handwriting stating "Type" . This specimen matches well with the illustrations and measurements given in the original description, and so we consider this specimen as the holotype fixed by monotypy. Figure 11. A Possible syntype Pterocyclos rupestris puriensis B, C syntype of Cyclotus pyrostoma D, E syntype of Cyclotus siamensis F, G syntype of Rhiostoma simplicilabre H, I syntype of Cyclotus spiniferus J holotype of Pterocyclos spiramentum K, L syntype of Cyclotus suluanus .