1. Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel. Basal two thirds of rhinophore brown. Large, translucent, whitish gills curving untidily outwards from transverse ellipse. Low water spring tide, Mersey Estuary. Late January 2010.
2. Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel. Basal two thirds of rhinophore brown. Large, translucent, whitish gills curving untidily outwards from transverse ellipse. Low water spring tide, Mersey Estuary. Late January 2010.

Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel. Basal two thirds of rhinophore brown. Large, translucent, whitish gills curving untidily outwards from transverse ellipse. Low water spring tide, Mersey Estuary. Late January 2010.