92 GENERA OF UNCERTAIN POSITION [( 



reaches a length of 10 cm. This species has been recorded from 

 the Argentine but no figures have been published. It is no 

 improbable that the seeds of the Samaropsis type associated with 

 the leaves in the Russian and Argentine localities may belong to 

 this genus, but proof is lacking. 



Rhipidopsis densinervis Feistmantel. 



This Indian species from the Raniganj group of the Damuda 

 series 1 . (Lower Gondwana) is founded on some leaf -impressions 

 very similar in size and form to Rhipidopsis ginkgoides. The 

 presence of a petiole is shown on one of the figured specimens : the 

 lamina is deeply divided into about six obcuneate segments that 

 appear to be irregularly lobed on the truncate margin. Rhipi- 

 dopsis densinervis is distinguished by its dense venation and by 

 a difference in size between the lateral and median segments less 

 than in the leaves of R. ginkgoides. Kurtz 2 states that some 

 specimens found by him in Permo-Carboniferous beds in th 

 Argentine may belong to this species. 



Rhipidopsis gondwanensis sp. nov. 



The specimens for which this name is proposed were described 

 by Feistmantel as Rhipidopsis ginkgoides 3 from the Barakar group 

 of the Damuda series. My examination of the type-specimens 

 confirms Feistmantel' s statement that they agree closely with 

 Schmalhausen's Russian leaves except in the'ir much smaller size : 

 the Indian leaves reach a length of 3 cm. while in Schmalhausen's 

 species the lamina may be 14 cm. in length. In view of this 

 difference and the wide geographical separation of the two forms 

 it would seem preferable to adopt a distinctive name. The 

 lamina is divided, almost to the base, into 6 10 segments; the 

 larger are cuneate and the smaller obovate and obtuse. 



SAPORTAEA. Fontaine and White. 



Fontaine and White 4 instituted this generic term for some in- 

 complete impressions of large leaves from Permian rocks in Virginia 

 having a broadly cuneate or suborbicular lamina characterised by 



1 Feistmantel (80) B. p. 121, PL XLVI. A. 



2 Zeiller (96) A. p. 467. 



3 Feistmantel (81) p. 257, PI. n. fig. 1; (86) PI. in. A. figs. 1, 2. 



4 Fontaine and White (80) B. p. 99, PI. xxxvra. 





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