116 THE OLDER MESOZOIC FLOEA OF VIRGINIA. 



of the lateral nerves, and the broad, flat midrib, make it clear, I think, that 

 the plant is the same with Pseudodanceopsis nervosa, from the Virginia 

 Mesozoic. 



Strangerites planus. 



Plate LIV, Fig. 3. 

 Emmons's "Am. Geol.," p. 122, fig. 90. 



" Frond even, smooth ; midrib narrow and gently tapering to a point ; side veins 

 dividing once, twice, and even three times. This species differs from the former in 

 being much longer and having a thinner midrib. Its leaf is also thinner and more 

 delicate, with a very uniform and even margin. Both species are found in the blue 

 slate at Ellington's, above a thick bed of conglomerate." 



Here again the nerves are made to stop short within the leaf, without 

 attaining the margin, when by continuing them they would anastomose 

 with their neighbors. From the narrow pinnules, the sharply-defined mid- 

 rib, and the fine nervation, it is clear that this is Pseudodanceopsis reticulata. 



Pterophyllum robustum. 



Plate LIV, Fig. 7. 

 Emmons's "Am. Geol.," p. 122, fig. 91. 



"Midrib thick and stout, striate; leaflets short, linear, imbricate; side veins distinct 

 (and parallel). The leaflets preserve a uniform width to the end, and terminate bluntly; 

 they have 8 to 9 veins each. This Pterophyllum occurs in a drab-colored sandstone, 

 300 to 400 feet above the blue shale at Ellington's, and immediately above a gray con- 

 glomerate, and 50 to 100 feet above this the red marly sandstone occurs." 



This appears to be a well-defined new species of Ctenophyllum of the 

 type of Ctenophyllum imbricatum. But for the less number of nerves I should 

 think it identical with Ctenophyllum JEmmonsi, previously mentioned. Ac- 

 cording to Professor Lesquereux, this plant occurs in the Mesozoic of Penn- 

 sylvania, at Phcenixville. 



Pterophyllum robustum, var. f 

 Plate LIV, Fig. 6. 

 Emmons's "Am. Geol.," p. 123, fig. 92. 



"Midrib rather thin and slender; leaflets short, about 8 ribbed or nerved ; leaf 

 rather thin and not imbricated. It appears to be the termination of the frond of P. 

 robustum. This occurs with the preceding." 



It is dearly the termination of the leaf of the preceding plant. 



