486 MESOZOIC FLORAS OF UNITED STATES. 



plants were obtained is a cutting on the Coast Line Railroad about 1 

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

 the base of the Potomac, for the Cambrian slates may be 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 veiy well. It is nearly on the horizon of the Cock- 

 pit Point pl'ants, but perhaps someAvhat 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 mj'self on 

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

 October 5, 1893. No new species occur in these collections, but they 

 contain the following plants: 



Acacijephyllum inicropliyllum Font l .3 specimens. 



Dioonites Buchianus (Ett.) Born 9 specimens. 



Dioonites Buchianus abietinus (Gopp.) Ward 1 specimen. 



Dryopteris parvifolia (Font.) Kn 1 specimen. 



Equisetum virginicum Font. ? 1 specimen. 



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



Sequoia subulata Heer 3 specimens. 



Sphenolepidium pachyphyllum Font 3 specimens. 



Sphenolepidium Sternbergianum densif olium 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 relatiye abundance 

 in the flora. 



Dioonites Buchianus abietinus (Goppert) Ward." 



PI. CVIII, Fig. 2. 



A very distinct specimen of Dioonites Buchianus abietinus is shown 

 in PL CVIII, Fig. 2. 



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



