OLDER POTOMAC OF VIRGINIA AND .MARYLAND. 505 



Baieropsis longifolia Fontaine. 



PI. CXI, Fig. ;^. 



1889. Baiewpsis longifolia Font.: Potomac Flora (Monogr. U. S. Geol. Surv., Vol. 

 XV), p. 210, pi. xci, fig. 6. 



This plant, it is true, is represented by only one specimen, but 

 this is a well-characterized one, showing a segment with several sub- 

 divisions of such a length as to indicate a leaf of great size. The seg- 

 ment is 7 cm. long, with a portion of the length wanting. This may 

 be a form of Baieropsis pluripartita, but it agrees closely with the plant 

 described as B. longifolia from the Rappahannock beds near Telegraph 

 station, now Lorton. This latter, however, may be B. pluripartita in 

 a form longer and with lacinise more slender than usual. The imprint 

 is on the specimen numbered M. G. S., 8448. 



Baieropsis pluripartita." 



B. pluripartita shows at least one specimen with two segments 

 that can not be mistaken. The other two specimens are not so distinct. 

 It does not seem to have been common at Hell Hole, while it is an 

 important fossil in the Rappahannock member of the Lower Potomac 

 of Virginia. It also may be regarded as a survivor. 



Celastrophyllum brookense Fontaine? 



PI. CX, Fig. 10. 



1889. Celastrophyllum broolcense Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 305, pi. clviii, fig. 8; pi. clix, fig. 7. 



There are in the collection two specimens of a dicotyledon that 

 is probably C. hrookense, but they can not be positively determined. 

 PL CX, Fig. 10, gives the best specimen, which is the end of a leaf. 

 The nerves are not fully shown. It is, in any case, a dicotyledon of 

 more modern aspect than the archaic ones that characterize the Rap- 

 pahannock member of the Lower Potomac of Virginia. The specimen 

 figured is numbered M. G. S., 8466, and the duplicate 8445. 



"Monograph XV, p. 208, pi. Ixxxix, fig. 4; pi. xc, figs. 2-5; pi. xci, figs. 1, 3, 4, 7; pi. xcii, figs. 1, 2, 6. 



