1. Onchidoris bilamellata. Length of animal 40mm. Many large tubercles, and a few small gills, within main gill ellipse. Low water spring tide, Mersey Estuary. Late January 2010.
2. Onchidoris bilamellata. Length of animal 40mm. Many large tubercles, and a few small gills, within main gill ellipse. Low water spring tide, Mersey Estuary. Late January 2010.

Onchidoris bilamellata. Length of animal 40mm. Many large tubercles, and a few small gills, within main gill ellipse. Low water spring tide, Mersey Estuary. Late January 2010.