Taking video pictures of molluscs climbing aquarium walls is quite
interesting. You will see that different species move in quite
different ways. Some move with a left and right track alternately.
Others have many narrow tracks that move in some pattern.
As to split tails: The forked tail is a characteristic of some species,
especially in Nassarius. Usually forked tails form a group in a family
or genus.
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Aloha from Wesley M. Thorsson
Editor of Internet Hawaiian Shell News, a monthly Internet Publication
122 Waialeale St, Honolulu, HI 96825-2020, U.S.A
http://www.hits.net/~hsn[log in to unmask]