Maryland Geological Survey 229 



has mentioned fossils which he states are very close to Baieropsis pluri- 

 partita Fontaine. 



Occurrence. — Patuxent Formation. Fredericksburg, Telegraph Sta- 

 tion (Lorton), Trents Eeach, Dutch Gap, Virginia; New Reservoir, 

 District of Columbia. Patapsco Formation. Hell Hole, 72d milepost, 

 near Brooke, Virginia ; Overlook Inn, Maryland. 



Collection. — U. S. National Museum. 



AcROSTiCHOPTERis EXPANSA (Fontaine) 



Baieropsis expansa Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 

 p. 207, pi. Ixxxix, fig. 3; pi. xc, fig. 1; pi. xci, fig. 2; pi. xcii, fig. 5 (non 

 pi. ixxxix, fig. 1 which is made the type of the genus Schizwopsis). 



Description. — " Leaves very large, having probably the width of 12 cm. 

 and the length of over 15 cm., attached by slender pedicels, and appar- 

 ently distributed as given in the generic description, i. e., pinnately on 

 leafy twigs, which themselves are arranged pinnately on a principal 

 stem, the main stem and branches ending in leaves of the normal kind; 

 leaves divided to near their bases into several principal laciniae, which in 

 turn are subdivided at varying heights into subordinate laminae, and 

 these into ultimate ones that are long and narrow, ribbon-like, with the 

 ends not seen; all subdivide dichotomously and diverge so as to give the 

 leaf a fan shape ; the ultimate lacinias, 1.5 mm. wide and under ; the 

 nerves distinct, although slender. They fork at the base in the primary 

 lacinias, and then repeatedly subdivide dichotomously in the laciniae at 

 varying intervals, the branches being more or less parallel." — Fontaine, 

 1890. 



In its vegetative characters the present species is not very different 

 from ScMzceopsis americana Berry, being, however, somewhat smaller, 

 with as yet unknown fructification characters and the veins with double 

 vascular strands. 



Occurrence. — Patuxent Formation. Fredericksburg, Dutch Gap, 

 Trents Eeach, Virginia. 



Collection. — U. S. National Museum. 



