02 Lacuna crassior. Shell height 3.1mm. Menai Strait. August 2013

02 Lacuna crassior. Shell height 3.1mm. Menai Strait. August 2013

Live occupied shell 1: H. 3.1 mm. 2: body whorl 85% H. 3: aperture 53% H.. 4: spout at base of lip. 5: columellar lip a broad white shelf. 6: adapical angle c. 90°. 7: periostracum extends beyond lip of aperture.