873 Rhac. 



ble on account of the obscurity of its outline and^divisions, on 

 account of its filmy na^^ure. Found also in Mazon creek nodules, 

 111., and at Cannelton, Beaver Co., Pa. XIII. 



Rhacophyllum ? scolopendrites. Lesq. ( Scolopendrites 



, jco:opr>ndjnt^s .^.ri^^^''^^^^^^;:^ (lentatus. Lesq. Geo. 



''^^^^fL.^-^-r^t^ Pa. Vol. 2,1858, p. 868, 



pi 8,fig.7.) Coal Flora, 

 1880, page 313; still of 

 uncei tain relationship ; 

 for Lesq. says he has 

 never been able to find 



/ />cr9'lflp4fliiWi^^ among fossil or recent 



' '• ^' ^ ferns anything like it ; 

 a mere fragment in brittle coal shale; affinity to Scolopen- 

 drkcm marked merely by ribbon shape of leaf; to Ehacophyl- 

 lum merely by its veins. Gate Vein^ New Philadelph^ia, Schuyl - 

 kill Co., Pa. Many of the specimens are wrinkled as if by 

 pressure. XIII 



Rhacophyllum truncatum ? Lesq. Coal Flora, 1880, page 

 311, plate 50, fig. 7. Instead of this figure I give the fine form 

 on plate 22 of Geol. Pa., 1858, described p. 830, as "• now and 

 then met with " in the CatsMll {Ponent) No. IX red rocks of 

 Pennsylvania; pronounced (p. 884) by J. B. Balfour to be a 

 probable gymnos permous plant like Salishuria adiantifolia. 

 Link; and by Sir J. W. Dawson, after seeing the specimen 

 in the cabinet of H. D. Rogers (now in Mus. N. H. Soc. 

 Boston). Lesquereux agrees to this, in referring it to his B. 

 jJnmm^Ji^m, which he found in ''Vespertine red shale" in the 

 river bluffs above Pittston, Pa., in company with Archceop- 

 teris minor. He refers also to C. H. Hitchcock's specimens of 

 Cyclopteris brownii from the Devonian of Maine. X. — Note. 

 For -figure see page 874* 



Rhaxella perforata, Hinde. Q. J. Geol. Soc. Lond. Feb. 

 1, 1890, Vol. XLVI, page 60, plate 6, fig. 1, natural size, a fine 

 specimen of sponge (quite free from matrix) in the museum 

 at York, England, from the lower Calcareous grit of Scar- 

 borough {Jurassic, Middle Oolite); figs. 2, nat 5i;s^, showing 

 slit structure ; f. 3 (X 2) section; f. 4 fX 20) section; f. 5. 



