PACHYPTEEIS. 171 



Cycads was much less marked than at the present day. It may 

 well be that Pachypteris is an extinct type in which fern-like 

 fronds were attached to a stem possessing the structure of a Cycad. 

 "We have recently been taught to recognize the intimate association, 

 and indeed the common origin, of Ferns and Cycads, and we 

 cannot expect, in dealing with fronds alone, to be able to draw 

 a sharp line of distinction between these two classes of the plant- 

 kingdom. The view that Pachypteris may represent an extinct 

 genus intermediate between Cycads and Ferns was held by Braun 

 in 1854, and this may well be the nearest approach to the truth. 

 In a recent paper on Cretaceous plants from Lesina, Krasser 1 has 

 given the history of the genus Pachypteris ; this author discusses 

 at length the affinity of the genus, which he includes among the 

 Cycadace. 



Pachypteris lanceolata, Brongniart. 



[Hist. ve"g. foss. p. 167, pi. xlv. fig. 1, 1828.] 

 (Text-figs. 27 and 28.) 



1828. Pachypteris lanceolata, Brongniart, Prodrome, p. 50. 

 P. ovata, ibid. 



P. lanceolata, Brongniart, Hist. vtfg. foss. p. 167, pi. xlv. fig. 1. 

 P. ovata, ibid. p. 168, pi. xlv. fig. 2. 



1829. Sphenopteris ? lanceolata, Phillips, Geol. Yorks. p. 153, pi. x. fig. 6. 

 Neuropterin lavigata, ibid. p. 154, pi. x. fig. 9. 



1836. Pachypteris lanceolata, Goppert, Foss. Farm. p. 179, pi. i. fig. 4. 



P. ovata, ibid. 

 1838. Pachypteris lanceolata, Sternberg, Flor. Vorwelt, fasc. vii. p. 55. 



P. ovata, ibid. 

 1845. Pachypteris lanceolata, Unger, Syn. Plant. Foss. p. 165. 



P. ovata, ibid. 



1848. Pachypteris lanceolata, Bronn, Ind. Pal. p. 891. 



1849. Pachypteris lanceolata, Brongniart, Tableau, p. 105. 

 P. ovata, ibid. 



1850. Pachypteris lanceolata, Unger, Gen. spec. foss. p. 307. 

 P. ovata, ibid. p. 308. 



1852. Pachypteris lanceolata, Ettingshausen, Abh. k.-k. geol. Reichs. vol. i. 



Abth. 3, p. 3. 

 1854. Pachypteris lanceolata, Morris, Brit. Foss. p. 14. 



1 Krasser (95). 



