630 PROCEEDINGS OF THE \ ITIONAL MUSEUM. tol. 38. 



ACROSTICHOPTERIS CYCLOPTEROIDES Fontaine emend. 



Acrostichopteris cyclopteroides Fontaine, Monogr. IT. S. Geol. Surv., No. !•">. L890, 



).. L09, pi. 94, fig. s. 

 Baieropsis denticulata Fontaine, Monogr. U. S. Geol. Surv.. Xo. r>. isno, p. _' !(), 

 pi. 93, fig. 7. 



Desert j>f ion. Pinnules rounded, fan-shaped, cyclopteroid, divided 

 into two or three principal segments which are split up into six or 

 more subordinate linear oblong divisions terminated by subacute 

 teeth. Rachis stout. Venation fiabellate, the single vein which 

 enters the base repeatedly forking dichotomously, the ultimate divi- 

 sions entering t he 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, as, for instance, Acrostic 

 chopteris parr [folia Fontaine. In the foreign Cretaceous it is rather 

 remotely suggestive of Sphenopteris jlabeUina Saporta" from the 

 Albien of Portugal. 



Occurrence. Patuxent formation. Dutch Gap, Virginia. 



Collections, U.S. National Museum. 



ACROSTICHOPTERIS PARVIFOLIA Fontaine emend. 



Acrostichopteris parvifolia Fontaine, (part), Monogr. Y. S. Geol. Surv., No. 15, 



1890, p. 108, pi. 94, figs. 5, 9, L0, L2; pi. 171, figs. 3, 4; pi. 172, fig. 4 (not 



Fontaine, to Ward, 190G). 

 Acrostichopteris densifolia Fontaine, Monogr. I'. S. Geol. Surv., Xo. 15, 1890, 



pi. 94, fig. 4 (not balance of figures). 

 Baieropsis adiantifolia minor Fontaine, Monogr. U. S. Geol. Surv., X<>. I">, 1890, 



p. 212, pi. 94, fig. 1. 

 Acrostichopteris parcelobata Fontaine, Monogr. I'. S. Geol. Surv., Xo. 15, 1890, 



p. 108, pi. 94, figs. (i. 7. 11, 14. 



Description. — Pinnules small and generally remote, the distal ones 

 short, all divided into three principal lobes, which are variously dis- 

 sected and terminated with two or more short stout teeth. Venation, 

 as usual in this genus. 



This species i^ thus far confined to the Patuxent formation of Vir- 

 ginia, the specimens Erom Maryland so identified by Fontaine proving 

 to belong to Acrostichopteris longipennis, which is somewhat similar 

 in appearance but usually much more dense in habit. 



The remains are rare and fragmentary at all of the recorded locali- 

 ties except Dutch (lap Canal, where they are not infrequent. They 

 show no traces of fructifications. This species is very closely related 

 to Acrostichopteris fimbriate Knowlton 6 of the Kootenai formation of 



" Saporta, Flora Fose Portugal, L894, p. 160, pi. 28, figs. 3, 6. 



6 Knowlton, Smith, Misc Coll . vol. •"><>. 1907, p. Mi), pi. 11, figs. 3, 3a. 



