MONSPELIENSINA Glacon and Lys. 1968

 

 

type species: Monspeliensina vulpesi Glacon and Lys. 1968; OD.Monspeliensina Glacon and Lys. 19M (-12431, p. 2302. Taxyella Anglada and Magné. 1969 (*42), p. 367: type species: Taxyella fontcaudensis Anglada and Magné.1969 — Montspeliensina vulpesi Glacon and Lys- 1968;OD.Test a low trochospiral. about three whorls visible on the flattened and evolute spiral side, chambers enlarging gradually, early ones may be partially obscured by a central boss. only the six to nine chambers of the final whorl visible on the slightly inflated and in-volute umbilical side. sutures gently curved, slightly depressed. chamber lumen incompletely divided by a bifurcating internal parti­tion that connects the sutural apertures and the areal intercameral foramen, the partition forming an umbilical chamberlet that opens both to the exterior and into the preceding chamber, the main part of the chamber com­municating with the preceding chamber by the areal foramen, periphery rounded; wall calcareous, of calcite, by X-ray determination, optically radial, finely and densely perforate, surface smooth; primary aperture an interio­marginal slit, extending from the umbilicus to the periphery, sutural supplementary apertures present on both sides, straight and narrow slits on the spiral side progressively filled with shell material with growth, openings on the umbilical side follow the slightly arched sulures, and an ovate areal intercameral fora-men occurs in the septal face of earlier cham­bers a short distance above the base and in nearly equatorial position. L. Miocene (Aquitanian): S. France.