. Bulletin of the Natural Histort Museum. Geology series. . Fig. 18 Jeronia pyrenaica Seunes, U lateral profile. All , from the late Danian of Larumbe (Navarra); MGB 37382, 1, apical surface: 2, oral surface: 3, posterior profile; 4, Family STEGASTERIDAE Lambert, 1917 Diagnosis. Test cordate, with prominent frontal groove from the ambitus to the peristome. Apical disc holasterid with four gonopores. Paired ambulacra with subpetaloid to rudimentary pore-pairs. Phyllode pore-pairs lacking from around peristome. Plastron orthostemous without rostral plate. Marginal fasciole may be present,
. Bulletin of the Natural Histort Museum. Geology series. . Fig. 18 Jeronia pyrenaica Seunes, U lateral profile. All , from the late Danian of Larumbe (Navarra); MGB 37382, 1, apical surface: 2, oral surface: 3, posterior profile; 4, Family STEGASTERIDAE Lambert, 1917 Diagnosis. Test cordate, with prominent frontal groove from the ambitus to the peristome. Apical disc holasterid with four gonopores. Paired ambulacra with subpetaloid to rudimentary pore-pairs. Phyllode pore-pairs lacking from around peristome. Plastron orthostemous without rostral plate. Marginal fasciole may be present, but no other fascioles are developed. Genus STEGASTER Pomel, 1883 Diagnosis. Thick-tested holasterid with flat base and cordate outline. Frontal groove absent adapically, deepening to ambitus with sharp keels and continuing as well-defined furrow to mouth. Petals rudimentary, flush. Plastron orthostemous. Periproct on posteiior face, just supramarginal with subanal tallon. No fascioles. Stegaster bouillei (Cotteau, in de Bouille, 1873) PL 5, figs 1-3; Figs 21, 22 1873 Holaster Bouillei Cotteau, in de Bouille: 450. 1889 Stegaster bouillei Seunes: 816, pi. 26, fig. 2. 1892 Stegaster bouillei Nickles: 111. Diagnosis. Test elongate, up to 75 mm in length; tapering to posterior truncation. Width about 90% of length. In profile subconical with tallest point anterior; height about 50-60% of length. Anterior PLATE 5 Figs 1-3 Stegaster bouillei (Cotteau, in de Bouille, 1873), BMNH EE6066, Maastrichtian of Sarasate, Navarra. Oral, apical and lateral views, xl. Figs 4-6 Stegasterpalaeocenicus sp. nov., MGB 37351 (holotype). Danian of Aristregui, Navarra. Lateral, oral and aboral views, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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