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.

Revised, illustrated species account of Lacuna pallidula (da Costa, 1778) Identification and Biology, (Mollusca, Littorinimorpha). If previous version downloaded please delete it. https://flic.kr/p/2kNL1A2 Lacuna parva shell is white often with three