238 CORDAITEAE [CH. 



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

 Scuto-Cordaites Grand? Euryi appear to be broadly linear, 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 1 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 fiabellatum. It is, however, impossible to determine the 

 true nature of the fossils from the published figures. 



CORDAITEAN LEAVES FROM INDIA, THE SOUTHERN HEMISPHERE, 

 AND SIBERIA. NOEGGERA THIOPSIS, FEISTMANTEL ; RHIPTO- 

 ZAMITES, SCHMALHAUSEN ; EURYPHYLLUM, FEISTMANTEL. 



I Cordaites aequalis Goeppert. 



\Cordaites (Noeggerathiopsis) Hislopi (Bunbury). 



In 1845 Goeppert 2 instituted the species Noeggerathia aequalis 

 (fig. 469) and N. distans for incomplete broadly linear 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 3 who agrees with 

 Kosmovsky 4 in identifying it with Noeggerathiopsis Hislopi 

 (Bunb.) and Rhiptozamites Goepperti Schmal. Schmalhausen 5 

 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 localities 

 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 allied genus, and point to the existence 

 of this group of Gymnosperms during Permo-Carboniferous 

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



1 Dawson (90) p. 3. 2 Goeppert (45 2 ) p. 7, Pis. xxvn. xxvm. 



3 Zalessky (12) p. 36; (12 2 ). See also Gothan (11). 



4 Kosmovsky (92). 5 Schmalhausen (79) A. p. 32; Zeiller (96) A. 



