Illustrated species account of Rissoella diaphana (Alder, 1848) (Mollusca, Heterobranchia. Including comparison with R. opalina (Jeffreys, 1848) and R. globularis (Forbes & Hanley, 1852). left) https://flic.kr/p/HARucc W/H (left to right): 54%, 59%, 60%.

Illustrated species account of Rissoa parva (da Costa, 1778) Identification and Biology (Mollusca, Littorinimorpha) and similar species. left) https://flic.kr/p/uxFKZK Costate form. 1: dark, non-costate, apical whorls nearly flat. 2: costate whorls convex.

Illustrated species account of Armina loveni (Bergh, 1866) (Mollusca, Nudibranchia). Includes photographic evidence to correct previous misconceptions about the anatomy of the cephalic shield. https://flic.kr/p/HjKSV3 1: lateral lamellae. 2: penis. 3:

Illustrated species account of Acanthodoris pilosa (Abildgaard in Müller, 1789) (Mollusca, Nudibranchia). left) https://flic.kr/p/MVByj4 L. 17 mm & fig. 02 (right) https://flic.kr/p/NTLFkr L. 11 mm, North Wales. High dome profile. Mantle covers whole