10 Tectura virginea. Shell-length 10.5mm. Anglesey, Wales. March 2014.

10 Tectura virginea. Shell-length 10.5mm. Anglesey, Wales. March 2014.

1: outer lip forms large prominent ridge around anterior and sides of mouth when not feeding.
2: end of outer lip is a loose flap.
3: peripheral efferent pallial blood-vessel.
4: blood passes from efferent pallial vessel into nuchal cavity to heart without going through ctenidium (probably gains oxygen through wall of e.p.vessel).

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