486 ^rEsozoIc floras of united states. 



plants were ()l)tainod is a cuttin<z; on tlie Coast Line Railroad al:)Out 1 

 mile south of the station. The rock material yieldino; the plants is at 

 the l)ase of the Potomac, for the Cambrian slates may he seen out- 

 cropping a few feet beneath the stratum carrying the plants. The 

 fossiliferous material is a buff to yellow shale, with good cleavage, which 

 preserves the plants very well. It is nearly on the horizon of the Cock- 

 ]Mt Point plants, but perhaps somewhat below that; both, however, 

 belong to essentially the same geological horizon. 



Two small collections have been made from this locality since the 

 appearance of Monograph XV. one by Professor Ward and m>'self on 

 July 26, 1893, and one by Professor Ward and Mr. Victor Mason on 

 October 5, 1893. Xo new species occur in these collections, but they 

 contain the following plants: 



Acacisephyllum imcroplij^lliini Font 3 specimens. 



Dioonites Buchianus (Ett.) Born 9 specimens. 



Dioonites Bucliianus abietinus (Gupp.) Ward 1 specimen. 



Drj'opteris parvifolia (Font.) Kn _ 1 specimen. 



Equisetum vii-ginicum Font. ?_ 1 specimen. 



Glyptostrobus (Taxodium) brookensis (Font.) Ward 3 specimens. 



Seqiioia subulata Heer 3 specimens. 



Sphenolepidium pachyphyllum Font 3 specimens. 



Sphenolepidium Sternbergianum densifolium Font.. .2 specimens. 

 Zamites tenuinervis Font. 1 specimen. 



It will be seen from the enumeration of the specimens that the 



collection is a small one. The number of specimens, however, as in the 



case of the Cockpit Point fossils, is no measure of the abundance of 



the plants. After considerable search it was seen that, at both these 



localities nearly all the forms had been previously described, and hence 



no attempt was made to secure all the specimens. Only the best and 



most characteristic were collected. Still, the numbers given for the 



several species named in the list fairly represent their relative abundance 



in the flora. 



Dioonites Buchianus abietinus (Goppert) Ward." 



PI. CVIII, Fig. 2. 



A very distinct specimen of Dioonites Buchianus abietinus is shown 

 in PI. CVIII, Fig. 2. 



" For synonymy, etc., see p. 2.50. 



