13 Cerithiopsis tubercularis

13 Cerithiopsis tubercularis

Asymmetric specimen; black band (1) flanks left tentacle, but not right tentacle; and median black band only present to left of centre line(2). Band of yellow opaque spots (3) behind each eye. Yellow marks (4) on opercular disc visible through transparent operculum.  Shell height 4.9 mm. Left & right views. Menai Strait. March 2012.