Pencil drawings of our three species of mussels here on the Seacoast: Horse, Blue and Ribbed Mussel. Horse mussels are found in slightly greater depth than blue mussels, which go up pretty high on the inter-tidal zone. The Ribbed Mussel is common in salt marshes and other brackish water.

From left to right: Smooth, Rough and Common Periwinkle (Littorina obtusata, saxatilis and littorea).

On the lower left a stack of two, with the lower one being a female and the top one being a male. Stacks can reach ten and more individuals and have given this snail its scientific name 'Crepidula fornicata'. It is edible and considered a delicacy in some part of the world.