New Species of the Genus Vulcanisphaera (Acritarcha) from the Tremadocian of England

Four new species of the genus Vulcanisphaera Deunff, 1961, are described from the Shineton Shales Formation, Tremadocian, England. The type species, V. africana Deunff, was previously recorded
from the Tremadocian of Africa and Belgium. It is now recorded by the present author in the Tremadocian of England. Genus Vulcanisphaera Deunff is emended because of new evidence of morphological variations of processes recorded in the new species.