I didn't answer not yet to juveniles of shells. I think it's very important to have also juvenil specimens
in the collection, as some has a different color from adults, some juveniles has a better structure
than in adults (very good to be seen in many Unionidae as Anodonta cygnea and anatina.
The waves the lines are very better to be seen in juveniles). Many  juvenile specimens of
Cypraeidae has a different pattern than the adults and like sometimes more an olivid shell
as a real Cypraea. In some juvenil (or subadult)  specimens of Vertiginidae and Chondrinidae
you can observe the growing of teeth eg.
So I think it's also important to have juvenils
with best shelling greetings
Helmut

Helmut "Helix" Nisters
Franz-Fischer-Str. 46
A-6020 Innsbruck / Austria / Innsbruck
phone and fax: 0043 / 512 / 57 32 14
e-mail: [log in to unmask]
web:    www.netwing.at/nisters/
           (please visit it and sign guestbook)
always looking for shellgrit from all over the world
for my nearly 89 years aged mother Irmgard
to makes happy and to keep up her health

office:
Natural History Department of the
Tiroler Landesmuseum Ferdinandeum Innsbruck
Feldstrasse 11 a
A-6020 Innsbruck / Austria / Europe
phone: 0043 / 512 / 58 72 86 - 37
web: www.tiroler-landesmuseum.at
        (specimen donations to the
         Tiroler Landesmuseum molluscs collection
         are always appreciated)