DESORIPTION OF THE SPECIES. 101 



ASPIDIUM PINNATIFIDl'M, Sp. IIOV. 

 VhUr XXI, Kij;. 1;'>. 



Frond unknown; probably bipinnatifid; reduced pinnre or pinnules, 

 linear, cut pinnately nearly to the rachis into ovate-falcate obtuse lobes or 

 pinnules; leaf-substance thick and leathery; sori in a row on each side of 

 the midrib, elliptical in shape and small, placed on the simple lateral 

 nerves within the margin of the lobes. 



Locality : Bank near Brooke : very rare. 



This is another of the Aspidie;e of the Didymochlama type. It is not 

 nearly like any described fossil. 



AspiDiuM DiTNivKin Schimper, sp. 



Plate XXII, Fifi. '.I; Plate XXV. Vf^s. II, 12: I'lalc XXVI, Kij;s. 2, b, y, 18; Plate LIV, Fis-S- 3, 9. 



Prcoplerh Diiiihri. Si-liiiiipcr. 'I'raitC-, vol. I, ]>. :>M). 



Pecopliih iiuliimoiyhn. Diiiikfi-, Mou., PI. VII. Fig. :>. 



Pecoplri-iK Vngcr'i, nmikcr, Moii., PI. IX, Fig. 10. 



Pccopleris DiDikrrK Sclienk, Foss. Flcir., PI. V, Figs. 1", I''; I'l. X, Fig. 1. 



Frond l)ipiniiate or tripinnate, arborescent; principal rachis stout and 

 rig-id; ultimate pinna- alternate, short, linear-lanceolate; pinnules alternate 

 or subopposite, shoi-t, closel}' placed, narrowed at the base, cut more or less 

 deeply into h)l)es or teeth which are ovate or oblono-, obtuse or subacute, 

 very small, those of the fertile portions of the frond staiidinn- lu-arly per- 

 pendicular to the rachis and having in each lobe or })innide a simple 

 lateral nerve which bears a soi-us on its summit, those of the sterile and 

 more common portions more obliquely placed, mostly subacute, with 

 nerves in each lolje that fork simply in the upper ones, and in the lower 

 ones are composed of a midnerve with alternate simple branches; leai- 

 sub.stance thick; sori very minute, club-shaped or elliptical, visible dis- 

 tinctly only with the help of a lens, and present only in the pinnules of 

 the lower part of the pinnte, and mostly found on the lobes towards the 

 base of these. 



Localities: Near Telegraph Station ; red clay ball in the banks of 

 Dutch Gap Canal; Fredericksburg; entrance to Trent's Reach; fishing 

 hut above Dutch Gap Canal; rather rare at all localities. 



