G34 PROCEEDINGS OF THE Yt'/'/ovi/, MUSEUM. vol.38. 



marantacea (Presl) Heer from the Keuper is a true Danaea and it 

 would be equally difficult to point out the differences between the 

 modern species and the Conns of Danaea which Zingo describes from 

 the Jurassic of northern Italy." 



TJENIOPTERIS AURICULATUM (Fontaine). 



Angiopteridium auriculatum Fontaine, Monogr. I. S. Geol. Surv., No. 15, 1890, 

 p. L13, pi. 7, figs. 8-11; pi. 28, fig. 1. 



Description. — Fontaine's original description is as follows: 



Frond pinnate; pinnules thick and leathery, long linear, subacute, remotely placed, 

 free u> the base, auriculate at base, attached by the midrib alone; auricles of the 

 liases of the pinnules overlapping the upper surface more or less; midrib of pin- 

 nules rather stent and rigid; lateral nerves often obscurely shown, fasciculate or 

 bifurcate, and toward the tips simply forked. 



The plant is rare at each locality, but is most common at Fredericksburg. It is 

 something like Pteris longipennis Eeer-6 but there is no reason to think that it is a 

 I'tiris. Ii also resembles Pecopteris salicifoliac Oldham and Morris. The forms 

 figured in tins. 8, 9, 11 occur at Fredericksburg; fig. 10 occurs at the locality near 

 Potomac Run. This is different from the others in the greal length of the pinnules 

 and in the fasciculate nerves, which are bifurcate, with the branches a^ain forking 

 near their tips. The nerves are obscure on the upper surface of the pinnules. The 

 main rachis is stout and keeled on the under surface, as is shown in fig. !). On the 

 upper surface the auricles at the base of the pinnules overlap more or less the Burface 

 of the main rachis. 



No new material referable to this species lias been collected. 

 Occum nee. — Patuxent formation. Fredericksburg and Potomac 

 Run, Virginia. 



Collections. — II. S. National Museum. 



TVENIOPTERIS NERVOSUM (Fontaine). 



Angiopteridium nervosum Fontaine, Monogr. U. S. Geol. Surv., No. 15, 1S90, 



' p. 111. pi. 29, fig. 2. 

 Angiopteridium densinerve Fontaine, Monogr. U. S. Geol. Surv., No. 15, 1890, 



p. 115, pi. 29, fig. 4. 

 Angiopteridium pachyphyllum Fontaine, Monogr. U. S. Geol. Surv., No. 15, 1X90, 



p. II".. pi. 29, fig. 5. 

 Angiopteridium strictinervi Fontaine, Monogr. U. S. Geol. Surv., No. 15, 1890, 



]>. 116, pi. 29, figs. S, 9 (not Fontaine in Ward. 1906). 

 Angiopteridium strictinerve latifolium Fontaine, Monogr. IT. S. Geol. Surv., 



NO. 15, 1890, p. lie. pi. 30, figs. 1, 5— Fontaine, in Ward, Monogr. I . S. 



Geol. Surv., No. 48, 1905. p. I'll. pi. 66, figs. 8 L0. 

 Anovio:<iinii<s angustifolius Fontaine, Monogr. I'. S. Geol. Surv., No. 15, I>'.m>. 



]>. 167, pi. 30, fig. 3 (not fig. 2). 

 Anomozamites virginicus Fontain e, Monogr. I'. S. Geol. Surv., No. r>. 1890, p. 168, 



pi. 30, fig. i: pi. 31, fig. 3. 



Description. I lahil unknown, although there are indicat ions in one 

 or two specimens that the frond was pinnate. Pinna* (or Frond) 



oZingo, Flora Fobs. Oolith., vol. I, 1856. 



Mleer. IV- Flora Ant., vol. (I, pi. 2, pi. 10, figs. 5 L3. 



c Foss. Flora of the Rajmahal series, pi. _>7, fig. •_>. 



