Fig. 6 in First post-Cambrian records of the reticulosan sponges Valospongia and Hintzespongia from the late Tremadocian of North Wales

Fig. 6. The hexactine-bearing sponge Hintzespongia? sp., NIGP154638, Dol-cyn-Afon Formation, upper Tremadocian, Lower Ordovician, Ceunant-ygarreg-ddu stream section, Arenig Fawr, North Wales, UK. A. Overall view of specimen showing several regions with exposed spicules, each revealing skeletal layers interpreted as having originally been dominantly diagonal (d), sub-orthogonal (o) or both (d, o), and with example of possible inner layer parietal gap (pg). B. Detail of central part of specimen, showing both diagonal and sub-orthogonal spicule arrays. C. Camera lucida drawing of region shown in B, with sub-orthogonal series stippled. Scale bars 5 mm. All photographs taken under water.