238 CORDAITEAE [CH. 



of a Clathrarian Sigillaria. The leaves of the type-specimen of 

 Scuto-Cordaites Grand' Euryi appear to be broadly hnear, 13 cm. 

 long, the breadth gradually increasing from the base: a short 

 distance from the proximal end the lamina is broken up into 

 narrow segments ; the veins are -5 mm. apart with finer striations 

 between them. 



Some specimens from Pennsylvania made by Dawson^ the 

 type of a new sub-genus and named Dictyo-Cordaites Lecoi agree 

 in shape and arrangement with some species of Cordaites, but 

 differ in an occasional anastomosis of the veins as in Psygmo- 

 'phyllum flabellatum. It is, however, impossible to determine the 

 true nature of the fossils from the pubhshed figures. 



CORDAITEAN LEAVES FROM InDIA, THE SOUTHERN HEMISPHERE, 



AND Siberia. Noeogera thiopsis, Feistmantel ; Rbipto- 



ZAMITES, ScHMALHAUSEN ; EURYPHYLLUM, FeISTMANTEL. 



) Cordaites aequalis Goeppert. 



\Cordaites {Noeggetathio'psis) Hislopi (Bunbury). 



In 1845 Goeppert^ instituted the species Noeggerathia aequalis 

 (fig. 469) and N. distans for incomplete broadly hnear and obovate 

 leaves, from Siberian Permian strata, having a contracted base 

 and equal parallel veins. The specimens so named are no doubt 

 specifically identical. Goeppert's species N. aequalis has recently 

 been carefully investigated by Zalessky^ who agrees with 

 Kosmovsky* in identifying it with Noeggerathiopsis Hislopi 

 (Bunb.) and Rhiptozamites Goepperti Schmal. Schmalhausen^ 

 had previously pointed out the probable identity of his species 

 with Noeggerathia palmaeformis Goepp. (= Cordaites). The 

 question of specific identity of these leaves from different locahties 

 and of other hardly distinguishable forms is of secondary import- 

 ance ; the main point is that they are all examples of Cordaitean 

 leaves, Cordaites or some alhed genus, and point to the existence 

 of this group of Gymnosperms during Permo-Carboniferous 

 times in Siberia, China, India, Austraha, South Africa, and 



1 Dawson (90) p. 3. ^ Goeppert (45^) p. 7, Pis. xxvn. xxvm. 



3 Zalessky (12) p. 36; (12^). See also Gothan (U). 



• KosmoTsky (92). « Sohmalhausen (79) A. p. 32; Zeiller (96) A. 



