388 Systematic Paleontology 



Hill, Md., is different from the others and is a Podozamites leaflet. 

 Corroborate evidence is furnished by the similarity in venation char- 

 acters and in the fact that all but one of the six so-called species, N. 

 decrescens, are from the single limited exposure at Fredericksburg, and 

 this was described from a nearby and probably synchronous outcrop and 

 is really present at Fredericksburg attached to a twig labelled N. Tietero- 

 pJiylla. Four of them are again associated at the Dutch Gap locality. 

 Again at Fredericksburg tJie typical forms of zamioides of Fontaine 

 are very abundant while the variants which he described as separate 

 species are represented in some cases by a single specimen, in others by 

 but two or three specimens. A glance at the various figures in 

 Fontaine's monograph and a perusal of the accompanying descriptions 

 will be convincing, and this is only emphasized by a comparison of the 

 specimens themselves. 



Compare for example fig. 5 of ovata with fig. 3 of zamioides and it will 

 be seen that they might have been drawn from the same specimen. 

 This is likewise true when the single specimen of N. decrescens is com- 

 pared with figs. 3 and 6 of N. microphylla, and similar comparisons can 

 be made back and forth indefinitely. 



Seward (Wealden Fl. pt. ii, p. 211, pi. xii, fig. 3, 1895) describes 

 and figures a few small fragments from the English Wealden at 

 Hastings and Ecclesbourne which he compares with N. Jieterophylla 

 Fontaine. 



The specimen figured shows well the branching habit and as near 

 as can be judged is a species of Nageiopsis. Since, however, the name 

 N. heteropJiylla Fontaine becomes a synonym of N. zamioides Fontaine 

 the English fossils may be given the latter name without much question. 



Occurrence. — Patuxent Formation. Fredericksburg, Dutch Gap, 

 Cockpit Point, Potomac Eun, Virginia. Aeundel Formation. Bay 

 View, Hobbs Iron Mine (?), Maryland; Langdon, District of Columbia. 

 Patapsco Formation. Federal Hill (Baltimore), Vinegar Hill, Well- 

 hams (?), Overlook Inn, Ft. Foote, Maryland; Chinkapin Hollow (?), 

 Virginia. 



Collection. — U. S. National Museum. 



