. Maryland geological survey. PTERIDOPHYTA. PLATE XXXVI. PAGE Figs. 1-6. Onychiopsis nervosa (Fontaine) Berry 279 1, 2. Specimens from Chinkapin Hollow, Virginia (after Fontaine).3, 4. Specimens from Federal Hill, Maryland (after Fontaine).5, 6. Specimens from near Glymont, Maryland. Figs. 7-9. Onychiopsis psilotoides (Stokes and Webb) Ward 274 Showing variation in form and venation of three corresponding pin-nules from different fronds. X 3. 535 MARYLAND GEOLOGICAL SURVEY. LOWER CRETACEOUS, PLATE

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