Figures 16-21 from: Oliver PG, Morgenroth H (2018) Additional Type and other Notable specimens of Mollusca from the Montagu Collection in the Royal Albert Memorial Museum & Art Gallery, Exeter. Zoosystematics and Evolution 94(2): 281-303. https://doi.org/10.3897/zse.94.24776

Figures 16-21 16. Nerita rufa Montagu, 1803 [Euspira sp. juveniles]. 16.1 Montagu hexagonal blue card mount and hand written label with 3 shells all EXEMS Moll4190. 16.2 Abapertural, apertural and basal views of a single shell, EXEMS Moll4190a. 17. Turbo sexdentatus Montagu, 1803 [Vertigo antivertigo (Draparnaud, 1801)]. 17.1 "Rowley" box with blue card mount and 8 shells, EXEMS Moll4129. 17.2 Apertural view of a worn shell. 17.3 Apertural and abapertural views of a fresh shell. All are Vertigo pygmaea (Draparnaud, 1801). 18. Turbo subtruncatus Montagu, 1803 [Truncatella subcylindrica (Linnaeus, 1767)] . 18.1 Montagu blue hexagonal card mount with printed label. 18.2 Larger, but broken, syntype EXEMS Moll4255b. 18.3 Smaller syntype, mostly apex EXEMS Moll5255b. 19. Trochus tenuis Montagu, 1803 [Calliostoma granulatum (Born, 1778)]. 19.1 "Rowley" box with 3 shells, syntypes, EXEMS Moll4184. 19.2 Apertural and basal views of a single syntype, EXEMS Moll4184a. 20. Helix trochiformis Montagu, 1803 [Euconulus fulvus (Müller, 1774)]. 20.1 Montagu blue hexagonal card and printed label with 4 shells, all syntypes, EXEMS Moll4313. 20.2 Basal and apertural views of a single syntype, EXEMS Moll4313a. 20.3 Scanning electron micrograph of the apex. 21. Helix umbilicata Montagu, 1803 [Pyramidula umbilicata (Montagu, 1803)]. 21.1 "Rowley" box with card mount and 7 shells, all syntypes EXEMS Moll4147. 21.2 apertural, dasal and apical views of a single syntype, EXEMS Moll4147a.