Dear Drew,
I can't help you with "Quaming Island", but I did look up your landsnail
dates for you. The ones that aren't listed are ones I couldn't find in my
reference:

Armenica laevicollis Charpentier, 1842

Armenica fausta Pfeiffer (sorry, I could not find the date for this one)

Armenica hethitica Nordseick (no date for this either)

Jaminia (Pseudochondrula) seductilis Rossmässler, 1837

Strigileuxina concavelamellata Loosjes, 1963

Euxina rolli Nordsieck, 1975

Euxina rackae Brandt, 1961

Euxina (Strumosa) strumosa Pfeiffer, 1848

Albinaria coerulea maculata Rossmässler, 1836

Albinaria forbesiana inauris Böttger, 1896

Chondrus zebra Olivier, 1801

Mucronaria duboisi Charpentier, 1852

Filosa filosa Mousson, 1863