Synopsis Four new species of petrified seeds are described: 1. Eccroustosperma langtonense gen. et sp. nov.—a curved platyspermic seed with two apical lobes of the integument and a rough sclerotesta when mature. 2. Hydrasperma tenuis gen. et sp. nov.—a small slender seed with 8–10 free apical lobes and longitudinal external ridges. 3. Stamnostoma bifrons sp. nov.—a barrel-shaped seed with a nucellar apex and micropyle intermediate in form between Stamnostoma huttonense and Sphcerostoma ovale. 4. Dolichosperma sexangulatum gen. et sp. nov.—a relatively long narrow radiospermic seed with a dense sixangled integument open above and without tentacles or micropyle. The salpinx was probably funnel-shaped. All four species are assigned to the Lagenostomales.
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Albert G. Long (1961) studied this question.
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