Dear all,

Eons ago, I collected some freshwater gastropods and bivalves at the very
touristy town of Marken (Netherlands). I have only just sorted them (shame
on me), and have no idea what they are, and cannot find any references on
them. The shells are briefly:

1. a triangular, zig-zag striped mussel kind of thing. The name Dreissena
polymorpha sticks somewhere in my mind, but I cannot find where I got that
name.
2. A thin bivalve about 5cm long, wich a nacreous interior
3. and 4. two species (?) of very thin gastropods with large inflated
whorls, reminiscent of Lamellariids
5. A hydrobiid of some kind with very inflated whorls
6. a gastropod with rounded whorls, about same height as width, umbilicate
7. a freshwater nerite!

I'd be happy to provide more detailed descriptions, and scans if possible
(some of these shells are very fragile) to those who think they can help me

Patty


Dr. Patty Jansen

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