Gryphaea, also known by the common name "Devils toenail," are a type of oyster. They are from the Phylum: Mollusca, Class: Bivalvia, Order: Pterioida, and the Family: Gryphaeidae.
These fossils are sold in lots of 100 pieces for $10.00.
Gryphaea - fossil oyster 
Quantity in Basket: None
Code: BF-120
Price: $10.00
Shipping Weight: 1.13 pounds
Time: Early Jurassic, approximately 195-180 million years ago.
Location: Wyoming