18 Steromphala umbilicalis. H. 6mm, B.11.5mm. Aug. 2013. Menai Strait, Wales.

Smooth-edged sub-rectangular right neck-lobe, curved to form respiratory siphon; cilia on dorsal surface create exhalent current. Ventral surface stippled yellow and dark purple. Fringed inhalent left neck-lobe.

 

Full SPECIES DESCRIPTION with links to images at: flic.kr/p/g3iVPG

 

Sets of OTHER SPECIES at: www.flickr.com/photos/56388191@N08/collections/.

 

Done