Flat Periwinkle

Flat Periwinkle

Observation - Flat Periwinkle. Description: Less than a centimeter. Bright yellow. Crawling around on wet rocks between pools where tide had just retreated. (Except - if it is a flat periwinkle - why are flat periwinkles called 'flat' periwinkles when they aren't flat?)

Less than a centimeter. Bright yellow. Crawling around on wet rocks between pools where tide had just retreated.

(Except - if it is a flat periwinkle - why are flat periwinkles called 'flat' periwinkles when they aren't flat?)