FIGS 2–11. Phylactella mediterranea sp. nov. (2) Part of a colony forming a laminar sheet. Gulf of Noto, PS/81 cruise: sample 9D, 78 m. (3) Portion of the same colony showing linear growth pattern. Gulf of Noto, PS/81 cruise: sample 9D, 78 m. (4) Zooids with well-developed peristomes lacking distal lamina. Gulf of Noto, PS/81 cruise: sample 9D: 78 m. (5) Uniserial row of sterile zooids budding either distally or laterally, at a right angle to the parental one. Case Catarinicchia: BC8 sample, inferred depthw40 m. Sicilian. (6) Primary orifice showing diagnostic features. Case Catarinicchia: BC8 sample, inferred depthw40 m. Sicilian. (7) Primary orifice protected by raised, partially damaged, peristome. Gulf of Noto, PS/81 cruise: sample 9D, 78 m. (8) Detail of a condyle. Ciclopi cruise: sample 12G, 83 m. (9) Doubled peristome of a regenerated zooid. Case Catarinicchia: BC8 sample, inferred depthw40 m. Sicilian. (10) Basal pore chamber. Ciclopi cruise, sample 12E, 62 m. (11) Ovicelled zooid. Note the unperforated frontal area and the peristomial lappets leant to the ovicell. Gulf of Noto, PS/81 cruise: sample 9D, 78 m. Scale bars: 500 Mm (2–5, 11); 100 Mm (6, 7, 9, 10); 10 Mm (8).