OLDER POTOMAC OF VIRGINIA AND MARYLAND. 491 



6. Two specimens were collected on June 23, 1896, from the Wliite House Bluff 

 locality by Lester F. Ward and Charles Louis Pollard. 



From all these collections the following species have been determined : 



Antholithes Gaudium-RosEe Ward . 3 specimens. 



Ai-alia ? vernonensis Font. n. sp 1 specimen. 



Aiistolochiffiphyllum ? cellulare Ward n. sp _ _ 2 specimens. 



Baieropsis denticulata angustifolia Font 2 specimens. 



Casuarina Covillei Ward 1 specimen. 



Celastrophyllum Brittonianum HoUick . _ 1 specimen. 



Celastrophyllum Hunteri Ward 2 specimens. 



Celastrophyllum ? saliciforme Ward n. sp 1 specimen. 



Cladophlebis rotundata Font 1 specimen. 



Dryopteris virginica (Font.) Kn 4 specimens. 



Ephedrites ? vernonensis Font. n. sp : 1 specimen. 



Ficophyllum crassinerve Font. ? 1 specimen. 



Glyptostrobus (Taxodium) brookensis (Font.) Ward 9 specimens. 



Leptostrobus longifolius Font 3 specimens. 



Menispermites tenuinervis Font 31 specimens. 



Menispermites virginiensis Font 27 specimens. 



Nageiopsis angustifolia Font 1 specimen. 



Nageiopsis longifoha Font. ? 1 specimen. 



Pinus vernonensis Ward n. sp 3 specimens. 



Populophyllum menispermoides Ward 24 specimens. 



Populophyllum minutum Ward n. sp_ _ _ 1 specimen. 



Populus auriculata Ward 9 specimens. 



Populus potomacensis Ward _" 22 specimens. 



Potamogetophyllum vernonense Font. n. sp 1 specimen. 



Protesephyllum reniforme Font 20 specimens. 



Rogersia angustifolia Font 4 specimens. 



Sagittaria Victor-Masoni Ward 1 specimen. 



Scleropteris vernonensis Ward 15 specimens. 



Sphenolepidium Sternbergianum densifolium Font 6 specimens. 



Sphenopteris grevillioides Heer 7 specimens. 



Sphenopteris latiloba Font 1 specimen. 



Sterculia elegans Font. ? 1 specimen. 



Thinnfeldia variabilis Font : _ 2 specimens. 



Thyrsopteris bella Font 2 specimens. 



ThjTSopteris decurrens Font. 1 _ . 2 specimens. 



ThjTsopteris rarinervis Font G specimens. 



Zamia Washingtoniana Ward 11 specimens. 



