II. Bassler — Cycadopliyte from the Coal Measures. 25 



present known distribution of Paleozoic cycadophytean re- 

 mains, the nature of which is reasonably above suspicion, may 

 prove of interest in this connection. This material gives 

 representation to three genera — the zamitoid genera Plagio- 

 zamites, confined to the Paleozoic, and Sphenozamites which 

 ranges from the Permian to the top of the Jurassic, and the 

 encephalartoid genus Pierophyllum which ranges from the 

 Westphalian (Carboniferous) to the Wealden (Cretaceous), 

 but is most extensively developed in the Ken per (Triassic). 



Fig. 2. 



In addition to Plagiozamiies Planchardi there are five 

 other described and figured species of this genus.* Plagio- 

 zamiies carbonarius (Renault) Zeiller occurs in the Permo- 

 Carboniferous, at the Tranchee de Foret in the Commentry 

 Basin and in the Lower Rothliegenden (Gehrener Schichten) 

 at Stockheim in Thuringia,f while P. minieri Renault sp., 

 P. aoicularis Renault sp., P. regularis Renault sp., and P. 

 Saportanus Renault sp. have not yet been reported outside of 

 the Commentry Basin, where they also occur in the Permo- 

 Carboniferous at Tranchee de Foret.;J: 



The single Paleozoic representative of the genus Spheno- 

 zamites is S. Rochei Renault § from the (Lower Permian) 

 Autunian shales at Lally in the coal basin of Autun in France ; 



*In Erlaut. z. geol. Specialkarte d. k. Sachs. Sect. Zwickau 1901, p. 135, in 

 a list of the more important Middle Eothliegenden plants of Saxony, Sterzel 

 gives Plagiozamites Liebeanits which in Pal. char. d. oher Steink. u. Eothl. 

 im erzgeb. Beck (Ber. d. nat. Ges. z. Chemnitz) 1881, he had described, with- 

 out figure, as Cordaites Liebeanus from the lower tuff in Helene-Schachte 

 near Olsnitz in Saxony. 



fPotonie, 1893, loc. cit. p. 210, pi. xxix. fig. 5. 



JEenault 1890, loc. cit., p. 614-618, pi. Ixvii, figs. 7-19. 



§ Eenault, 1896, Flore foss. bass, houill et perm d' Autun et d'Epinac, 

 p. 327, pi. 81, fig. 1. 



