I bet Harry Lee will be the first to answer this...

I collected several living & dead polygyrids, about 2.5cm in
diameter, in forests during rain in the Kananaskis region of the
southern BC Rockies this month.

Back in NZ, I checked Abbott's Compendium and came up with Allogona
ptychophora. Abbott's illustration shows no parietal denticle.
However all of my 5 specimens have a denticle; in one it is extremely
small but in others it is of decent size and spirally-aligned.

I guess this is a variable character; it would take almost nothing
for my small-denticled specimen to have had NO denticle. Does anyone
know if Abbott chose an atypical specimen tio illustrate?

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