. Bulletin of the Natural Histort Museum. Geology series. LATE CRETACEOUS-EARLY TERTIARY ECHINOIDS 125. Fig. 33 Camera lucida drawing of plating in Isaster aqiiilanicus (de Grateloup, 1836) from the late Thanetian of Casas de Oraien (Navarra); BMNH EE6202, oral surface. Scale bar = 5 mm. Genus HEMIASTER Agassiz. in Agassiz & Desor, 1847 Diagnosis. Apical disc ethmophract. Anterior sulcus weak or absent. Hemiaster prunella (L&maick, 1816) PI. 9, figs ll-14;Fig. 35b, c, e 1816 Spatangus prunella Lamarck: 33. 1855 Hemiaster prunella Lamarck; d'Orbigny: 242. pi. 881. 1856 Hemiaster prunell
. Bulletin of the Natural Histort Museum. Geology series. LATE CRETACEOUS-EARLY TERTIARY ECHINOIDS 125. Fig. 33 Camera lucida drawing of plating in Isaster aqiiilanicus (de Grateloup, 1836) from the late Thanetian of Casas de Oraien (Navarra); BMNH EE6202, oral surface. Scale bar = 5 mm. Genus HEMIASTER Agassiz. in Agassiz & Desor, 1847 Diagnosis. Apical disc ethmophract. Anterior sulcus weak or absent. Hemiaster prunella (L&maick, 1816) PI. 9, figs ll-14;Fig. 35b, c, e 1816 Spatangus prunella Lamarck: 33. 1855 Hemiaster prunella Lamarck; d'Orbigny: 242. pi. 881. 1856 Hemiaster prunella ]^axmrck\T>e?,ov: 122. 1927 Hemiaster prunella (Lamarck); Lambert: 50. 1973 Hemiaster(Bolbaster)batalleriLambtn; Radig: 10. figs 4-7. 1992 Hemiaster (Bolbaster) gr. prunella (Lamarck); Gallemf: 347. 350. 1996 Hemiaster (Bolbaster) prunella (Lamarck); Wilmsen etal.: 354. Diagnosis. Test up to about 10 mm in length; almost as wide as long; subglobular with weakly domed upper surface; tallest point more or less coincidental with the apical system. In profile, the posterior face is more or less vertical or slopes slightly outwards. Apical disc ethmolytic with four gonopores. Anterior ambulacrum slightly sunken adapically. but becoming flush towards the ambitus; pore-pairs strongly oblique. Anterior petals rather narrow, diverging at ca. 110-120°. Posterior petals about half the length of the anterior petals; not strongly bowed. Peripetalous fasciole oval without inden- tation behind anterior petals. Periproct high on posterior face. Peristome small, kidney-shaped with prominent rim. Labral plate elongate; about half the length of the succeeding sternal plates. Material studied. BMNH EE4401-02, EE6240-49. EE6252- 61, MOB 37476,37503,37515-16,37518,37524,37529,37534-36, 37538-40, 37547, 37558-59, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrat
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