08 Littorina arcana Y1009. Dissected female from 10.6 mm high shell. N. Yorkshire, September 2014. Specimen Y.

08 Littorina arcana Y1009. Dissected female from 10.6 mm high shell. N. Yorkshire, September 2014. Specimen Y.

1: rectum.
2: well developed pallial oviduct with transverse septa in jelly gland and, at posterior, opaque white albumen gland. (No brood pouch with embryos). No ciliated field detectable next to oviduct or near anus.
3: back of head.

Feature 2 is diagnostic for differentiating L. arcana from L. saxatilis s.s..

No full account yet of this species.
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