Need help identifying 4 shells

[paul monfils]

I had to smile when I saw this picture of Glycymeris reevei with the "X" on it.  Years ago I received a lot of several specimens of this species, each shell having the two valves tied together with some kind of tacky elastic twine, once around the shell, then turned 90 degrees and around the shell again. When I pulled the twine off (with some difficulty - it stuck tight) it left an "X" marking, exactly like the specimen in this picture, and I could never get the marking off.  I tried bleach, various solvents, scouring powder, boiling, etc. Something in that twine must have reacted with the shell surface.  <span class="petit">--Last edited by Paul Monfils on 2010-03-06 05:33:57 --</span>