OLDKi; I'OTOMAC OF VIIJGIMA ANl^ MAHYLAXD. 511 



Kojld'sia loimilciliii KdUt 4 s])('('iiiu'iis. 



ScliTdptcris clliptica l>\)nt , 2 s|)('ciiiu'iis. 



S|)liciu)l('])i(iiiiin St('riil)('r<j:i!imim dfiisifolium Font G spcciincns. 



Splieiioptoris latil<)l)a Foul. ( . 2 spccinu'iis. 



Thyrsoptoris hclla Font^ _ _ . 1 spccinu'ii. 



Thyrso])tons crassinervis Font l) s[)('ciin('n.s. 



Thyrso]itori.s (iocurrons Font 12 spccinicns. 



Thyrs<)])t('ris dcnsifolia Font- 4 s])0('init'ns. 



Thyrsopteris divaricata. Font 4 spccinions. 



Thyr.soi)tcris nervosa Font (i specimens. 



Thyrsopteris jiinnatifula Font. ? . _ _ _ _ . 1 specimen. 



Zamiopsis insiirnis Font. .... 1 7 specimens. 



To obtain this vuri(My of fossils only an impevfoct ex{:)osiii'o, partly 

 under walof, was available. Xo consitlcrahle amount of time was 

 devoted to colhH'tinfi;. Xo excavation was made and only the outcrop 

 as exposed was examined. 



AN(ii()rTEKn)U'M STiticTixERVE Fontaine. 



PI. ex, Fig. 12. 



1889. An(ji()p1( rldiuiii .sirictintrvc Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XV), p. 11(1, ])l. xxix, ligs. S, Sa, 9. 



Only a single specimen of this plant was found on April Ki, 1893, 

 consisting of the lower half of a pinnule from which the leaf substance 

 had disappeared, leaving the -nervation distinctly impressed upon the 

 clay matrix. This is shown in PI. CX, Fig. 12. 



Cladophlehis falcata F'ontaine. 



PI. CXI, Fig. 6. 



1889. 01 adophlebis falcata Font.: Potomac Flora (Monogr. U. S. Cieol. Surv., Vol. 

 XV), ]). 72, pi. iv, figs. 8, Sa; pi. v, figs, 1, la, 2-4, 4a, .5, .5a, (3, 6a. 



This plant also is rare. The best of the three specimens foimd is a 

 portion of an ultimate pinna with several well-preserved pinnules of the 

 largest size. It is shown in PL CXI, Fig. 6, of this paper. 



