Gould argued that in some cases, the reversed printing of gastropods was deliberate, though I do not now remember his reasoning.

The apex-down configuration for gastropods seems most prevalent in French publications.  Cossmann's work, for example, has them this way.

    Dr. David Campbell
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That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droigate Spa