. Bulletin of the Natural Histort Museum. Geology series. 96 SMITH ETAL. Genus PHYMOSOMA Haime, //; d'Archiac & Haime, 1853 Diagnosis. Test depressed with apical disc opening large and peristome hardly invaginated. Pore-pairs forming short phyllodes adorally and becoming biserial adapically. Primary tubercles rela- tively coarse, occupying most of the interambulacral plate. Tubercles imperforate and crenulate. Phymosoma granulosum (Goldfuss, 1829) PI. 2, figs 3, 4 1829 Cidarites granulosus Goldfuss: 122, pi. 40, fig. 7. 1865 Cyphosoma granulosum Cotteau, in Cotteau 1861a-67a: 684, pi.
. Bulletin of the Natural Histort Museum. Geology series. 96 SMITH ETAL. Genus PHYMOSOMA Haime, //; d'Archiac & Haime, 1853 Diagnosis. Test depressed with apical disc opening large and peristome hardly invaginated. Pore-pairs forming short phyllodes adorally and becoming biserial adapically. Primary tubercles rela- tively coarse, occupying most of the interambulacral plate. Tubercles imperforate and crenulate. Phymosoma granulosum (Goldfuss, 1829) PI. 2, figs 3, 4 1829 Cidarites granulosus Goldfuss: 122, pi. 40, fig. 7. 1865 Cyphosoma granulosum Cotteau, in Cotteau 1861a-67a: 684, pi. 1169. 1898b Gauthieria broeki Lambert: 152, pi. 4, figs 1-5. Diagnosis. Test 20-25 mm in diameter, depressed in profile with rounded ambitus. Ambulacra with five-geminate plate compound- ing; pore-pairs arranged in arcs on ambital plates but becoming biserial towards the apex. Large primary tubercle on ambulacral plates, separated by single band of granules on ambital plates. Short phyllodes developed adorally. Interambulacral plates a little wider than tall and dominated by a single large primary tubercle with a large mamelon. Narrow adradial and interradial bands. Peristome hardly invaginated. Occurrence. Maastrichtian, horizon 2, Santander. Material STUDIED. BMNHEE6127. Remarks. Distinguished from Diplotagma sp. by its relatively coarse interambulacral tuberculation, the tubercles largely filling each interambulacral plate. Distinguished from Acanthechinus sp. in having its peristome hardly invaginated and in having obvious adoral phyllodes. P. hexaporum is similar, but has more pore-pairs to each ambital ambulacral plate (six or seven as opposed to five) and has distinct secondary tubercles to the adradial side of primary tubercles on ambital and supraambital plates. Phymosoma hexaporum Lambert, 1927 PI. l,fig. 15; Fig. 7 1927 Phymosoma hexoaporum Lambert: 35, pi. 2, figs 25-27. 1928 Phymosoma hexaporum Lambert: 61. 1992 Phymosoma hexaporum Gallemi: 80, fig. 24. Diagnosis.
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