OLDKi; POTOMAC OF VIUOINIA AM> M AKVI.AXD. 505 



Baikmoi'sis i.oNiiiii 111 a l-'oniainc. 

 PI, CXI, Kiu. ■■■. 



18S9, Baifropnia InngifoJia Font,: I'ntoniMc Flora (M(m()<j:r, V. S. CkhiI, Siirv,, Vol, 

 XY). ]), '-'lO, ])1, xci, fig. ('', 

 Tills plant, it is true, is repr(>s(Mit(Hl by only ouo spcrinieii, hut 

 this is a woU-charat'terizod one, showiiijj; a segment willi several sub- 

 divisions of such a leniTth as to indicate a leaf of i,n-eat siz(\ The seg- 

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

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

 described as B. longifolia from the Rai)pahamiock beds near Telegraph 

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

 a form k)ngei' and with lacinise more slender than usual. The impiint 

 is on the specimen numl)ered M. G. S., S448. 



BaIEROPSIS I'LUHU'ARTITA." 



B. plnripartita 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. 



Celastroi'iiyllum urookense Fontaine? 



PI. CX, Fig. 10. 



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

 Vol. XV), ]), ^M)'^. pi. clviii, fig, S; pi. clix, tig. 7. 



There are in the collection two specimens of a dicotyledon that 

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

 PI. 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. 



"Monograpli XV, p. 208, pi, Ixx.xix, fi{,', 4; pi. .\c, figs, 2-5; pi, xci, figs, 1, 8, -1, 7; pi. xcii, figs, 1, 2,6. 



