248 Systematic Paleontology 



and rounded, the latter having the tips round-lobed and very obtuse; 

 nerves varying according to the position and shape of the pinnules, those 

 of the round-lobed pinnules and of the pinnae reduced to pinnules flabel- 

 lately diverging in each lobe, the branches being either forked or simple. 

 The nerves of the subrhombic pinnules have a midnerve, which sends 

 off alternately on each side forked or simple branches. All the nerves 

 are very strongly marked and stout. The leaf-substance is thick and 

 leathery.''— Fontaine, 1890. 



The foregoing description was written for CladopJilebis rotundata, but 

 it requires no alteration to include the rare fragments which were named 

 Cladophlebis hrevipennis, as the material on which the two were founded 

 is identical, in fact, the description of the latter was practically a para- 

 phrase of the former. 



This species, while founded upon rather scant remains, is characterized 

 by the strong venation and the breadth of the short ovate pinnules. It 

 may possibly represent Cladophlebis constricta Fontaine, closely re- 

 sembling the form of this latter species which Professor Fontaine named 

 Cladophleiis latifolia. It has been recorded by Penhallow from Yukon 

 Territory in Canada, but the identification is queried as being very 

 doubtful. 



Occurrence. — Patuxent Formation. Fredericksburg, Dutch Gap, 

 Virginia. Patapsco Formation. Mt. Vernon, Chinkapin Hollow, 

 Virginia. 



Collection. — U. S. ISTational Museum. 



Cladophlebis virginiensis Fontaine 

 Plate XXIX, Figs. 4-6 



Asplenium distans Dawson, 1886, Trans. Roy. Soc. Can., vol. iii, sec. iv, 



1885, p. 5, pi. iii, fig. 7 (non Heer). 

 GladophleMs virginiensis Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 



1889, p. 70, pi. iii, figs. 3-8; pi. iv, figs. 1, 3-6 (non Fontaine, 1906). 

 GladophleMs falcata Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 



p. 72, pi. iv, fig. 8; pi. v, figs. 1-6; pi. vi, fig. 7; pi. vii, figs. 1, 2. 

 GladophleMs acuta Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 



p. 74, pi. V, fig. 7; pi. vii, fig. 6; pi. x, figs. 6, 7; pi. xi, figs. 7, 8; pi. 



clxvi, fig. 5. 



