. Maryland geological survey. PTERIDOPHYTA. Cockayne, Boston. PLATE XXIII. PAGE Figs. 1, 2. AcEOSTicHOPTEBis LONGiPENNis Fontaine 223 1. Federal Hill, Maryland (after Fontaine). 2. Hell Hole, Virginia (after Fontaine). Figs. 3, 4. RuFFORDiA GoEPPERTi (Dunker) Seward 231 3. Fredericksburg, Virginia (after Fontaine). 4. Pinna of same. X 3. Figs. 5, 6. RuFFOKDiA ACRODENTATA (Fontaine) Berry 230 5. Dutch Gap, Virginia (after Fontaine). 6. Pinna of same. X 2. 522 MARYLAND GEOLOGICAL SURVEY. LOWER CRETACEOUS, PLATE XXIII.

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