226 SystemxItic Paleontology 



AcROSTicHOPTERis CYCLOPTEROiDES Fontaine 

 Plate XXIV, Fig. 1 



Acrostichopteris cyclopteroides Fontaine, 1890, Mon. U. S. Geol. Survey, 



vol. XV, 1889, p. 109, pi. xciv, fig. 8. 

 Baieropsis denticulata Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 



1889, p. 210, pi. xciii, fig. 7. 

 Acrostichopteris cyclopteroides Berry, 1910, Proc. U. S. Natl. Mus., vol. 



xxxviii, p. 630. 



Description. — Pinnules rounded, fan shaped, cyelopteroid, divided into 

 two or three principal segments, which are split up into six or more sub- 

 ordinate linear oblong divisions terminated by subacute teeth, Eachis 

 stout. Venation flabellate, the single vein which enters the base re- 

 peatedly forking dichotomously, the ultimate divisions entering the 

 teeth. 



This species is poorly characterized and is based upon infrequent and 

 very fragmentary material from the single locality cited. It may well 

 represent a slightly variable form of pinnule of one of the other more 

 abundant Patuxent species, e. g., Acrostichopteris parvifolia Fontaine. 

 In the foreign Cretaceous it is rather remotely suggestive of Sphenopteris 

 flabellina Sap.^ from the Albian of Portugal. 



Occurrence. — Patuxent Formation, Dutch Gap, Virginia. 



Collection. — IT. S, National Museum. 



Acrostichopteris parvifolia Fontaine 

 Plate XXIV, Figs. 4, 5 



Acrostichopteris parvifolia Fontaine, 1890 (pars), Mon. U. S. Geol. Survey, 



vol. XV, 1889, p. 108, pi. xciv, figs. 5, 9, 10, 12; pi. clxxi, figs. 3, 4; pi. 



clxxii, fig. 4 (non Font., in Ward, 1906). 

 Acrostichopteris densifolia Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 



1889, pi. xciv, fig. 4 (non balance of citation). 

 Baieropsis adiantifolia minor Fontaine, 1890, Mon. U. S. Geol. Surv., vol. 



XV, 1889, p. 212, pi. xciv, fig. 1. 

 Acrostichopteris parcelobata Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 



1889, p. 108, pi. xciv, figs. 6, 7, 11, 14. 

 Acrostichopteris parvifolia Berry, 1910, Proc. U. S. Natl. Mus., vol. xxxviii, 



p. 630. 



1 Saporta, Fl. Foss., Portugal, 1894, p. 160, pi. xxviii, figs. 3, 6, 



