has now been identified - and my thanks to everyone who assisted. I've
now taken better pics and it's quite clear what it is now. A signal
crayfish.

https://picasaweb.google.com/1087352...KvnlKap1ZvGnQE

--
Old minds are like old horses;
you must exercise them if you wish to keep them in working order.
~John Quncy Adams