Figure 2

Paralia specimens from W. Smith’s ([ 17 ], pl. 53, figure 338) drawings and BM1021 preparation. The BM1021 preparation, containing P. marina from Kinsale Harbour, Ireland (circa ca. 1850) is the generitype for Paralia [15]. Valves and chains labelled 1–4 and 7 correspond to Smith’s concept of P. marina, as deduced from BM1021 preparation. Those labelled 5, 6 and 8–10 show fenestrae which correspond more closely to P. sulcata s.s. [10] and P. fenestrata [12]. (A) Smith’s ([17], pl. 53, figure 338) drawings of valves and chains. (B-D) Valve face view. (B,C) Large and smaller intercalary valves. (D) Separation valve. (E) Internal view of valve. (F-I) Mantle of interlocked valves. (F-H) Intercalary. (I) Separation. Scale bars = 5 μm (D-I), 2 μm (B,C).