19. Mactra dealbata Pulteney sensu Montagu, 1803 [Standella pellucida (Gmelin, 1791)] 19.1 Old NHMUK labels indicating provenance of Laskey Coll. The larger label reads {Purchd of Capt. Laskey who called it the Mactra dealbata of Montagu, asserted that he found it in the Firth of Forth near the mouth}. 19.2 Interior and exterior of entire right valve, NHMUK 20170127. 19.3 Interior of damaged left valve. 20. Helix decussata Montagu, 1803 [Zebinella decussata (Montagu, 1803)] 20.1 Montagu hexagonal blue card with 2 syntypes, EXEMS Moll4239a-b. 20.2 Apertural and abapertural view of larger syntype, EXEMS Moll4239a. 21. Turbo decussatus Montagu, 1803 [Parthenina decussata (Montagu, 1803)] 21.1 Montagu wooden plinth with blue card attached, 1 shell remaining, empty scars present. EXEMS Moll4273. 21.2 Base of box with original Montagu label attached and identified as such by J.R. le B. Tomlin. NHMUK 1998072. 21.3 Abapertural and apertural (SEM) views of syntype EXEMS Moll4273. 21.4 Apertural view of syntype NHMUK 1998072. 22. Voluta denticulata Montagu, 1803 [Myosotella denticulata (Montagu, 1803)] 22.1 Montagu hexagonal blue card with 2 sh. and empty scars. 22.2 Abapertural and apertural views of Lectotype EXEMS Moll4100a. 22.3 Abapertural and apertural views of Paralectotype EXEMS Moll4100b. 23. Helix detrita Montagu, 1803 non Müller, 1774 [Drymaeus elongatus (Röding, 1798)] 23.1 Old label for lot 4299. 23.2 Abapertural and apertural views of syntype EXEMS Moll4299. 23.3 SEM of protoconch.

  Part of: Oliver PG, Morgenroth H, Salvador A (2017) Type specimens of Mollusca described by Col. George Montagu in the Royal Albert Memorial Museum & Art Gallery, Exeter and The Natural History Museum, London. Zoosystematics and Evolution 93(2): 363-412. https://doi.org/10.3897/zse.93.13073