524 MESOZOIC FLORAS OF UNITED STATES. 



doubtful. PI. CXII, Fig. 9, gives the best specimen. This was col- 

 lected b}' Mr. Bibbins for the Maryland Geological Survey on June 10, 

 1896. 



Saliciphyllitm ellipticum Fontaine. 



PI. CXI. Fig. 10. 



1SS9. Saliciphyllum ellipticum Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 303, pi. cxlvi, figs. 2, 4; pi. cl, fig. S; pi. clxiii, fig. 5; pi. clxvi, 

 fig. 2. 



This seems to have been one of the rarer plants in the Langdon 

 strata. In the considerable number of specimens collected by Pro- 

 fessor Ward and Mr. Bibbins only two are referable to this species. 

 One of these specimens is nearh^ the whole of the upper part of a leaf, 

 as given in PL CXI, Fig. 10. The margins are not well preserved. 

 These leaves are not so well preserved as some of those figured in Mono- 

 graph XV, but the finer nervation is a little better shown. Both the 

 specimens were collected by Mr. Bibbins for the Maryland State 

 Geological Survey on June 10, 1896. 



Sphenolepiditjm Sternbergianum dexsifglium Fontaine." 



PI. CXII, Figs. 10, 11. 



Sixty specimens of this conifer, with short acicular leaves, were 

 found in the collections. Most of them are poorly preserved and 

 obscure, but some are distinct enough to be identified without doubt. 

 This species occurs on all the horizons of the Lower Potomac of Vir- 

 ginia, but it is most common on the upper one, or that of the Aquia 

 Creek strata. Some of the specimens show very delicate leaves whose 

 full character can be made out only with the help of a lens. Although 

 smaller even than the most slender of the Virginia forms, they do not 

 othenvise seem different, and hence can hardly be made a new variety. 

 PL CXII, Fig. 10, represents one of the stoutest forms, being a frag- 

 ment of an ultimate twig. This was collected by Professor Ward in 

 May, 1897. Fig. 11 depicts one of the small delicate kind showing 

 portions of several ultimate twigs. This was obtained from the nodule 

 of iron ore broken up by Professor Ward and Dr. Hollick on July 

 14, 1897. 



"Seepp 507, .524. 



