. Bulletin of the Natural Histort Museum. Geology series. LATE CRETACEOUS-EARLY TERTIARY ECHINOIDS a_ >-. b 105. Fig. 13 Camera lucida drawings of plating in Oolopygus sp. and Zuffardia sp. from the Maastrichtian of the coast west of Cabo Mayor (Santander, Cantabria); a. Oolopygus sp., BMNH EE6169, apical disc; b. c, Zuffardia sp., BMNH EE6153; b, apical disc; c, phyllode and peristome margin. Scale bars = 1 mm. and with V-shaped phyllodes comprising a single series of pores. Periproct supra-ambital, on the underside of a large lobate projec- tion; opening appears wide and slit-like in post
. Bulletin of the Natural Histort Museum. Geology series. LATE CRETACEOUS-EARLY TERTIARY ECHINOIDS a_ >-. b 105. Fig. 13 Camera lucida drawings of plating in Oolopygus sp. and Zuffardia sp. from the Maastrichtian of the coast west of Cabo Mayor (Santander, Cantabria); a. Oolopygus sp., BMNH EE6169, apical disc; b. c, Zuffardia sp., BMNH EE6153; b, apical disc; c, phyllode and peristome margin. Scale bars = 1 mm. and with V-shaped phyllodes comprising a single series of pores. Periproct supra-ambital, on the underside of a large lobate projec- tion; opening appears wide and slit-like in posterior profile. Oral tuberculation arranged with a strong bilateral symmetry. Rhynchopygus sp. Occurrence. Maastrichtian, horizon 4, Santander Material studied. BMNH EE6162. Remarks. Our record is based on a single specimen, representing the posterior portion of a test. This shows the highly characteristic lobe-like projection above the wide and slit-hke periproctal opening. There are two species of Rhynchopygus, R. mannini {Agassiz) and R. donetzensis (Faas), differing primarily in the development of their petals. As our specimen does not show the petals, it cannot be assigned to species level. Genus RHYNCHOLAMPAS Agassiz, 1869 Diagnosis. Small cassiduloids with a flat base and ovate outline. Peristome small, subcentral, weakly transverse to as wide as long; rim of peristome hardly swollen; deep well leading into peristomial opening. Periproct supra-ambital; transverse, hardly sunken. Rhyncholampas macari (Smiser, 1935) PI. 3, figs 15. 16 1935 Rhynchopygus macari Smiser: 63, pi. 6, fig. 6. 1987 Procassidulus macari (Smiser); Van der Ham et a!.: 30, pi. 11, fig. 6. Diagnosis. Test up to 33 mm in length; elongate with flat base and depressed upper surface. Width 75-80% of length, widest posterior of mid-length; height no more than 35% of length. Apical disc a little anterior of centre, with four gonopores; probably tetrabasal, but plating not seen. Petals well-developed, bowed an
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