OK, sometimes I am a little dense. I have been living next to the Celery Farm for more than a dozen years, and I have seen shells by the trail and at the Warden's Watch. Yet I never paid them much attention.

But on a recent walk, Barbara Brummer of The Nature Conservancy wanted to know what the above shell was. I said I didn't know...

The next time I saw her, she had found out.  What did she learn?

Flip-side view follows. Part One was last week.