Posted by John Carr on 19-08-2013 15:01
#1
On a pile of kelp on a beach in California, USA, August 18, 2013.  I think this is Tethinidae (aka Canacidae).
Edited by John Carr on 02-11-2014 15:45
 
Posted by Paul Beuk on 22-08-2013 10:50
#2
Tethinidae have now been incorporated in Canacidae, and it seems to be one of that family.
 
Posted by John Carr on 02-11-2014 15:37
#3
Possibly 
Tethina milichioides, a widespread West Coast species.