18 Rissoa lilacina

18 Rissoa lilacina

Part of operculum (1). Substantial white ctenidium (2) stretches from left to right under the roof of mantle cavity; greatly exposed to view as much of the body whorls have been broken way, probably by crabs. Males have a penis (3) attached to the body behind the cephalic tentacles.
Shell height 3.7 mm & 3.6 mm. North Wales, March 2015.
: flic.kr/p/2ogofx8
Sets of OTHER SPECIES: /