XXVn] CARDIOPTERTS 623 



The occurrence in Lower Mesozoic European rocks of fronds 

 hardly distinguishable from the older southern species may be 

 regarded as favourable to the view already expressed, that some 

 at least of the Permo-Carboniferous plants migrated north of 

 the Equator. The resemblance between the Vosges Triassic 

 species of Schizoneura^ and the examples of this genus recorded 

 from the Lower Gondwana rocks of India afifords additional 

 evidence of a northern migration. 



Our knowledge of the reproductive organs of Neuropteri- 

 dium is practically nil. There is no doubt that Zeiller^ and 

 Blanckenhorn^ are correct in regarding the Bunter fronds 

 assigned by Schimper and Mougeot to the genus Grematopteris 

 as the fertile leaves of N europteridiuw, intermedium or some 

 other species from the same horizon. These fronds bear crowded 

 pinnules similar to those of Neuropteridium intermedium, 

 N. Voltzii*, and other species, exhibiting on the exposed surface 

 numerous carbonaceous spots which may be the remains of 

 sporangia. 



Cardiopteris. 



Schimper^ applied this generic name to Lower Carboniferous 

 fronds of a simple-pinnate habit which had previously been 

 described as species of Cyclopteris. Cardiopteris frondosa may 

 serve as a typical example. This species, originally described by 

 Goeppert as Cyclopteris frondosa (fig. 350), is recorded from 

 Lower Carboniferous rocks in the Vosges district® in Silesia, 

 Moravia^, and Thuringia*. The pinnules, which are attached 

 in opposite pairs to a broad rachis, vary in length from 2 to 

 10 cm. and have a breadth of 2 to 8 cm. ; in manner of attachment 

 and venation they agree with those of Neuropteridium. validum. 

 The venation is very clearly shown in a drawing of some large 

 pinnules figured by Stur^. 



The specimen of Cardiopteris frondosa, a portion of which 



1 Vol. I. p. 292. 2 Zeiller (OO^). » Blanckenhorn (85) p. 129, PI. xxi. 



* Blanckenhorn loc. cit. The specimens figured by this author are in the 

 Strassburg Museum, as are also some of those figured by Schimper and Mougeot. 



* Schimper (69) A. p. 452. " Schimper and Koeohlin-Schlumberger (62) A. 

 7 Ibid. 8 Pritsch, K. (97). " Stur (75) A. PI. xiv. fig. 1. 



