FLORA OF THE KOOTANIE FORMATION. 303 



to enable one to make out without doubt the genus. The largest imprint, 

 the one given in PL LXXII, Fig. 15, is a fragment of an ultimate branch 

 with a number of leaves, only a few of which are well enough preserved 

 to show their shape and dimensions. The twigs seem to have been 

 slender and to have had closely placed leaves, which, in their present 

 state of preservation, are in two rows. They are only 2 mm. long and 

 about half a millimeter wide at their bases, their widest portion. They 

 are so closely placed that their bases overlap. In shape they are elongate- 

 oblong, widening to the base and at the opposite end narrowing gradually 

 to an acute tip. Their exact mode of attachment could not be made 

 out. They appear to be decurrent, with the bases of adjacent leaves 

 overlapping. No nerves are visible. Fig. 16 gives a fragment enlarged, 

 showing as much detail as could be made out. The plant resembles 

 Araucaria obtusii'olia Font.," but the leaves are much smaller, propor- 

 tionally wider at base, and much more acute. It seems to be nearer 

 Lycopodifes than any other plant, and I have with doubt placed it in 

 this genus. 



Class GYMNOSPERMiE. 

 Order CYCADALES. 



Family CYCADACEiE. 



Genus NILSONIA Brongniart. 



NiLSONiA ScHAUMBURGENSis (Duiiker) Nathorst. 



PI. LXXII, Figs. 17-2L 



1843. PteropJiyllum scJiaumhurgense Dunk.: Programm. d. hoheren Gewerbschule 



inCassel, 1843-44, p. 6. 

 1846. Pterophyllum scJiaumhurgense Dunk.: Monogr. d. Norddeutsch. Weaklen- 



bildung, p. 15, pL i, fig. 7; pi. ii, fig. 1 ; pk vi, figs. 5-10. 

 1870. Anomozamites schaumburgensis (Dunk.) Sckimp. : Pak Veg., Vok II, p. 141, 



Atlas, pk Ixx, figs. 5, 6. 

 1889. Nilssonia schaumburgensis (Dunk.) Nath.?: Anzeiger d. k. Akad. d. Wiss. in 

 Wien, Jahrg. XXVI, No. 24, p. 237. 



a Potomac Flora (Monogr. U. S. Geol. Surv., Vol. XV), p. 249, pi. Ixxxv, fig. 13. 



