Common Flat Periwinkle

Common Flat Periwinkle

Observation - Common Flat Periwinkle. Description: In the higher eulittoral zone. All the Periwinkles here tend to be black rather than yellow, red, green, banded, etc.

In the higher eulittoral zone. All the Periwinkles here tend to be black rather than yellow, red, green, banded, etc.