232 SYSTEMATIC PALEONTOLOGY 



Feuilles Foss. Toscane, vol. i, pi. v, figs. 4-6 and vi, figs. 1-3, etc.) and 

 Lesquereux, from the United States (Tert. FL, pi. xxv, figs. 4, 5; Cret. 

 and Tert. Fl., pi. xlix, fig. 1). The latter author also described and fig- 

 ured what is apparently this species under the name Acer cequidentatum 

 sp. nov. (Mem. Mus. Comp. Zool. Harvard College, vol. vi, No. 2, p. 26, 

 pi. vii, figs 4, 5) which, however, is not the same species as that figured 

 under the name in his Tertiary Flora, pi. xlviii, figs. 1, 3. Gceppert's fig- 

 ures 1. c. and also his figures of P. ceynhausiana (1. c. pi. x, figs. 1-4) ap- 

 parently all represent one species, identical with that from Maryland. It 

 may be questioned whether figures 2-5 on Plate LXXIY should be included 

 with the others. They appear to represent leaves in which the margins 

 were entire or very coarsely dentate, as in P. mexicana Moric, but there 

 is not enough upon which to base a description. Figure 5, last quoted, 

 apparently represents a portion of a basilar lobe, such as may often be 

 seen in P. occidentalis and similar to the appendages of P. basilobata 

 Ward (Synop. Fl. Laramie G-r. 6th Ann. Eept. U. S. Geol. Survey, pis. 

 xlii, xliii). No such lobe or appendage is indicated in any of the figures 

 of P. aceroides or its nearest allies, and this might perhaps constitute a 

 distinctive feature which would be regarded as specific. 



Occurrence. — Sunderland Formation. Near the headwaters of Is- 

 land Creek, Calvert County. 



Collections. — Maryland Geological Survey. 



Platanus sp. ? 

 Plate LXXV. 



Description. — This is apparently a portion of a very large Platanus 

 leaf. It was approximately 12 inches in width and 8 or 9 inches in 

 length. 



Occurrence. — Sunderland Formation, Point of Rocks, Calvert 

 County. 



Collections. — Maryland Geological Survey. 



