Harry, Ayden and Kurt,
Thank you for your information.
I will check out the umbilicus of these specimens but, based on locality
alone, it looks like they are all cereolus. As to the variation in
size, I hve about 100 specimens so it might be worthwhile to do an
analysis of the group. Based on a quick visual survey, there seem to be
two very distinct size ranges. Aydin, I will report back after I find
the time to sit down and measure them all.
Thanks again,
Phil Liff-Grieff
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La Crescenta, California
PS Once again, Conch-L comes through with flying colors- even for us
land snail types!