1. 2 Archidoris pseudoargus. Gills arranged around anal papilla (arrow) which is coloured as mantle. Orange faeces, from consumption of sponge, resting on gill. Menai Strait, Wales. March 2012.
2. 2 Archidoris pseudoargus. Gills arranged around anal papilla (arrow) which is coloured as mantle. Orange faeces, from consumption of sponge, resting on gill. Menai Strait, Wales. March 2012.

2 Archidoris pseudoargus. Gills arranged around anal papilla (arrow) which is coloured as mantle. Orange faeces, from consumption of sponge, resting on gill. Menai Strait, Wales. March 2012.