104 Arber . — A Revision of the Seed Impressions of the 
Genus Pterospermum, gen. nov. 
Seeds large, elongate, angular in section, the angles being produced 
into flap-like, broad wings, nearly as long as the main portion of the seed. 
Pterospermum anglicum , sp. nova (PL VIII, Figs. 51-52). 
TypeV. 1183, Geol. Dept., British Museum (Nat. Hist.), from the Middle 
Coal Measures of South Staffordshire. The only known example. 
Seed large, (?) triangular in section, which is of small area, elongate, 
5*5-6 cm. long and 2-3-2 *6 cm. across between the wings. Three (? more) 
large, flap-like wings arise one from each angle, 5 cm. long and 2 cm. or more 
in breadth. Testa smooth. 
BIBLIOGRAPHY. 
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Geinitz, E. (’75) : Uber neue Aufschliisse im Brandschiefer der unteren Dyas von Weissig, bei 
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