Maryland Geological Survey 295 



A single specimen from Fredericksburg figured by Fontaine (1890, 

 pi. xxix, fig. 9), and showing apparently the basal portion of three pinnae 

 lying in the same plane and direction, and two of them attached to stout 

 bits of rachis, is the only evidence that the fronds were pinnate and not 

 simple. These may represent aerial stalks, or they may equally well be 

 interpreted as fragments of a rhizome or a rootstock. 



This species is not common in the Potomac Group, and is confined to 

 the Patuxent formation. Similar remains are described from both the 

 Knoxville and Horsetown beds of the Pacific Coast, and similar frag- 

 mentary specimens are described by Saporta^ from the Valanginian of 

 Portugal and referred to Schimper's genus Oleandridium. In the Euro- 

 pean Wealden there is Oleandridium B ey ricMi ^chenk' from Germany 

 and England which Seward refers to TceniopteriSj and two other forms 

 of questionable distinctness which the latter author describes from the 

 English beds.^ Oleandra arctica Heer * from the Kome beds of Green- 

 land may be compared with the Potomac Tgeniopterids. ISTewberry ° 

 identifies this species in the Kootanie of Montana, the latter forms at 

 least being probably identical with the Virginia species. 



Occurrence. — Patuxent Formation. Fredericksburg, near Potomac 

 Run; near Telegraph Station (Lorton), Virginia. 



Collection. — U. S. National Museum. 



Genus TEMPSKYA Corda 

 [Beitr. z. Fl. der Vorwelt, 1845, p. 81] 



This peculiar gelius was founded by Corda in 1845, who diagnosed it 

 in the following terms : "^ Truncus .... Rhachis rotundata, plicata 

 vel alata; cortice crassiuscula, fasciculis vasorum ternatis, majori clauso 

 vel lunulata et supra incurvo, minoribus oppositis lunulatis. Radices 

 minutse numerosissimse ; fasciculo vasorum centrali unico." 



^Saporta, Fl. Foss. Portugal, 1894, p. 85, pi. xv, fig. 3; pi. xvi, fig. 18. 



* Schenk, Palseontographica, Bd. xix, 1871, p. 221, pi. xxix, figs. 6, 7. 

 ' Seward, Wealden Fl., pt. i, 1894, pp. 127, 128. 



* Heer, Fl. Foss. Arct, Bd. iii, Ab. ii, 1874, p. 38, pi. xii, figs. 3-11. 

 Newberry, Amer. Jour. Sci. (Iii), vol. xli, 1891, p. 201, pi. xiv, fig. 9. 



