552 MESOZOIC FLORAS OF UNITED STATES. 



which are grouped as if they had gone off from an ultimate twig not 

 now present, and also, on the right, the end of an ultimate twig, from 

 which two bundles of linear leaves proceed. It was collected September 

 2, 1896, and is deposited in the National Museum. 



Nageiopsis recttrvata Fontaine? 

 PL CXVI, Fig. 2. 



1S89. Nageiopsis recurvata Font. : Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 197, pi. Ixxv, fig. 2; pi. Ixxbc, fig. 4; pi. Ixxx, fig. 3. 



Several leaves of a Nageiopsis that is much like N. recurvata 

 occur on the same rock fragment that contains the more imperfect cone 

 of Abietites marylandicus. (W. C, B., No. 6149, see PI. CXV, Fig. 5.) 

 One of the leaves is nearly entire. It has the dimensions and the peculiar 

 curvature of the leaves of N. recurvata, as given in the specimens from 

 the Lower Potomac of Virginia. It is regarded as doubtful only 

 because the curved nature of the leaf may be accidental, and it may be 

 simply a large leaf of A'', zamioides. 



Pecopteris virginiensis Fontaine. 



Pi. CXVI, Figs. .3, 4. 



1889. Pecofteris virginiensis Font.: Potomac Flora (Monogr. U. S. Geol. Surv., Vol_ 

 XV), p. 82, pi. viii, figs. 1, la, 2, 2a, 2b, 3, 3a, 4-7, 7a; pi. Lx, figs. 1, la, 2, 

 2a, 3-6; pi. xxiv, figs. 2, 2a; pi. cLxix, fig. 3. 



Eight specimens of a fern that can be certainly identified with P. 

 virginiensis of the Lower Potomac of Virginia were found at Vinegar Hill. 

 This is the most abundant fern found here in these collections and some 

 of the specimens are well enough preserved to show verj'- distinctly its 

 character. The most complete forms show only fi-agments of pinnae 

 carrying a number of serratelj- toothed pinnules. PI. CXVI, Fig. 3, 

 shows the best of these. It was collected on September 2, 1896, and is 

 deposited in the National Museum. 



In Mr. Bibbins's collection for the Woman's College of Baltimore 

 P. virginiensis occurs in two specimens formed of portions of penultimate 

 pinnae with pinnules fairly well preserved. One of these specimens (PL 

 CXVI, Fig. 4) appears to be fructified, but if so the fructification is too 

 obscure to be made out. This specimen is No. 6169 of the Museum of 



