Long-time readers may know that my most popular blog post ever was about these whelk egg cases. We have two types in the upper Mid-Atlantic and the Northeast.
The pinched edges of these capsules mean this it the egg case of the Channeled Whelk/Busycotypus canaliculatus.
Here’s one of the capsules separated from the chain. Often these are empty, or filled with sand, or tiny broken bits of shell.
Sometimes, the baby shells are still within. They never made it out before the string washed ashore.
Some of the 3mm long shells from the capsule. The dark spots within are the late whelks themselves.
I examined about two dozen of these egg cases in hope of finding a Knobbed Whelk egg case for comparison purposes. Busycon carica egg capsules have squared-off edges, making them look like thick coins. I didn’t find any. But I did find some passengers on the exteriors of the Channeled egg capsules. Here’s a barnacle. Take a look at that second image again above. There’s a Parchment Tubeworm casing in the middle of the image.
I also found this tiny, 2mm long snail shell attached to the exterior. I think this is the shell of the grass snail Vallonia excentrica, but that’s a land species, so I’m not sure why it was stuck to the capsule on a egg case string in the wrack.
Additionally, I found a number of small white mostly round blobs wedged in between the capsules. I wasn’t until I took off my gloves and pressed one that I realized it was styrofoam.
Here’s another beach in the Lower Bay.
Damned stuff will last for centuries upon centuries.
Backyard and Beyond 
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