14 Myosotella myosotis form denticulata.

14 Myosotella myosotis form denticulata.

The roof of the mantle cavity contains a network of haemolymph vessels and is very thin, enabling oxygen from inhaled air to diffuse into the vessels and for carbon dioxide to leave with the exhaled air. Occasionally the vessels are visible through the translucent shell (1).
Shell height 4.8 mm. Menai Strait, Wales. June 2013.

marinvert.senckenberg.science/image-browse/