OLDER POTOMAC OF VIRGINIA AND MARYLAND. 479 



atively few Jurassic elements, they having apparently died out. A 

 number of forms not found in the basal beds appear. The number of 

 dicotyledons is so much increased that they form the predominant 

 plants. The most abundant ones are of more modern aspect than those 

 of the basal beds and the characteristic archaic forms of the latter have 

 mostly disappeared. 



FOSSIL PLANTS PROM THE JAMES EITER. " 



The following species occur in the collections from the banks of the 

 James River, the only localities represented being those at Dutch Gap 

 (see Monograph XV, p. 12) and Sailors Tavern (see ibid., p. 14) : 



Baieropsis pluripartita Font 1 specimen. 



Dioonites Buchianus (Ett.) Born 3 specimens. 



Podozamites distantinervis Font. ? ^ 1 specimen. 



Sphenopteris latiloba Font 1 specimen. 



Zamites tenuinervis Font. ? _ 1 specimen. 



Baieropsis pluripartita Fontaine. "^^ 

 PI. CVII, Fig. 1. 



1889. Baieropsis pluripartita Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 208, pi. IxxxLx, fig. 4; pi. xc, figs. 2, 2a, 3, 4, 4a, 5; pi. xci, 

 figs. 1, 3, 3a, 4, 7; pi. xcii, figs. 1, 2, 6. 



Dioonites Buchianus (Ettingshausen) Bornemann.* 



Pi. CVII, Fig. 2; PI. CVIII, Fig. 1. 



In 1895 Mr. Bibbins obtained from Sailors Tavern, for the Woman's 

 College of Baltimore, two good specimens of Dioonites Buchianus, which 

 are represented on PL CVII, Fig. 2, and PL CVIII, Fig. 1. This is a 



« Professor Fontaine does not mention this plant in his report, although he returned the specimen so 

 labeled. It was collected by himself at the entrance to Trents Reach below the Dutch Gap Canal in 1892. 

 In a letter from him dated October 17, 1892, he says: 



" I send you a small piece of shale containing a seeming drupaceous fruit, apparently attached by a short 

 pedicel to the summit of the petiole of a leaf of Baieropsis, where the lamina of the leaf begins to divide. I 

 should be glad if you would carefully examine and see if this is a real attachment and not an accidental loca- 

 tion of the seed. If it is a real attachment, then we have for the first time found the fruit of Baieropsis, which 

 in some points would resemble that of Ginkgo. The leaf is that of Baieropsis pluripartita, and comes from 

 the entrance to Trents Reach. Please put the specimen in your collection. I found it since writing the 

 description of the .James River plants." 



I do not find any reply to this letter, but I remember examining the specimen and concluding that the 

 seed was not probably attached to the leaf by the side of which it occurs. It may, however, belong to this 

 plant. Both the seed and the leaf are figured in PI. CVII, Fig. l.—L. F.W. 



6 For the synonymy of this species see pp. 244-245. 



