552 MESOZOIC FLORAS OF IMTHD 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 l)undles of lineai' leaves proceed. It was collected September 

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



Xageioi'sis recurvata Fontaine? 

 PI. CXVI, Fig. 2. 



1SS9. Nageiopsis recurvata Font.: Potomac P'lora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 197, pi. Ixxv, fig. 2: pi. l.xxix, fig. 4: pi. Ixxx, fig. 3. 



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

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

 of Abidites marylandicus. (W. C, B., No. 6149, see PL 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 ^'irginia. It is regarded as doubtful only 

 because the curv-ed nature of the leaf ma}' be accidental, and it may be 

 simply a large leaf of N. zamioides. 



Pecopteris virginiexsis Fontaine. 



PI. CXVI, Fig.s. 3, 4. 



1889. Pecopteris 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 very distinctly its 

 character. The most complete forms show only fragments of pinnae 

 carrying a number of serrately 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. virginienms occurs in two specimens formed of portions of penultimate 

 pinnie with pinnules fairly well pre.served. One of these specimens (PL 

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

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



