Shells > Tiny & Small Shells 1/4, 3/8, 1/2'' openings   Black Striped shells 1/2'' opening A round opening shell that is ideal for small purple pincers and rugosus crabbies! $ 0.40          Unavailable      More Information Cancellaria 1/4'' opening Two pack of Cancellaria shells with 1/4" opening. A "D" shaped shell opening that is ideal for small equadorian crabbies!...although I have had purple pincers that love these shells too! $ 0.45          Available: 28      More Information      Quantity:     Green Turbo 1/4'' opening 2 pack Two pack of green turbos with 1/4" shell opening. A round opening shell that is ideal for small purple pincers and rugosus crabbies! $ 0.50          Available: 19      More Information      Quantity:     Pol. Cinerius Turbo 1/2'' opening A round opening shell that is ideal for small purple pincers and rugosus crabbies! $ 0.50          Available: 6      More Information      Quantity: