Pete...when fly fishing for scallops I have had great success using the "shallow butter stick" fly.
Juro's rules for success apply:
1. presense of scallops
2. mood (shells open)
3. presentation (strip, then hover buttter stick over the open shells)
4. fly...the butter stick (margarine although less expensive to tie, just doesn't cut it IMHO)
Cripe...those make me hungry just looking at them!!!!