1. Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel, rest of mantle fawn brown. Pale unpigmented club-shape tubercles on mantle. Low water spring tide, Mersey Estuary. Late January 2010.
2. Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel, rest of mantle fawn brown. Pale unpigmented club-shape tubercles on mantle. Low water spring tide, Mersey Estuary. Late January 2010.

Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel, rest of mantle fawn brown. Pale unpigmented club-shape tubercles on mantle. Low water spring tide, Mersey Estuary. Late January 2010.