>  I noticed a difference in counting whorls when reading Likharev and >  Rammelmeier (1952) "Lands Snails of....USSR" book. Normally when >  counting whorls a -the first- semicircle of embyronic turn is omitted >  and 360 dgress afterwards is accepted as 1 turn, so that 1st turn >  counted resembles profile of a Nautilus. But in that book, i think, the >  semicircle is not omitted and 1st turn counted ends where parallel to >  the median line of the semicircle passes (total count is 1/2 turns less >  than the former). Is there any other applications?
>
>  The other question, when counting clausiliids a practical method is to >  count whorls from the frontal view, i.g. mouth facing you. How do you >  count similar slender snails like Subulinidae etc.?

You need to be consistent and to make it clear what you do so that someone else can figure it out and do the same thing, if there's a nedd to replicate your study.  Unfortunately, things aren't as well-standardized as they ought to be.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

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 Droitgate Spa

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