Is this a shell?

[Metallicakid418]

Out looking for sand dollars today at plum island with wife and kids and found this i was wondering if its a type of shell thats worn down?

 

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[Ga_Farm_Hunter]

I do believe that is a shell, I myself have found some of those before on Myrtle Beach, SC.

 

[nhbenz]

I would guess that to be the remains of an oyster shell.

 

[TheCannonballGuy]

I believe NHBenz is right... it's a seriously worn-down oyster shell.