VALVULAMMINA Cushman, 1933

 

 

Type species: Valvulina globularis d'Orbigny, 1826 (*2303), p. 270 (err. cit. as V. globulosa by Cushman, 1933, *769, p. 37); OD.

Valvulammina Cushman, 1933 (*769), p. 37.

Test planoconvex, low trochospire of about five inflated chambers per whorl, enlarging rapidly so that the final chamber occupies about one-half of the umbilical surface of the test, sutures arched and oblique on the spiral side, radial and straight on the umbilical side; wall canaliculate, finely agglutinated, largely of calcareous particles, with a proteinaceous lining; aperture umbilical in position, par­tially covered by a broad umbilical flap that occupies about one-third of the test diameter, those of earlier chambers remaining visible within the open umbilicus. Eocene; France; Cuba.