278 COKDAITEAE [CH- 



The supposed stem, as Flicliei has shown, is a pith-cast and is 

 appropriately named by him Endolepis vogesiacus. The Vosges 

 leaves are assigned by this author to the genus Cordaites, a change 

 of name which may eventually be justified though as yet based 

 on insufficient evidence. There are objections to the institution 

 of a new name in place of Yuccites, but it is undesirable to retain 

 a designation suggesting false ideas with regard to affinity. A new 

 name Pelourdea (after M. Pelourde of Paris, whose recent death 

 deprives Palaeobotany of an able and promising investigator) 

 is therefore proposed for leaves of the Yuccites type which in 

 form, venation, and spiral phyllotaxis agree with those of Cor- 

 daites but cannot confidently be assigned to that genus or even 

 to the Cordaitales. For linear leaves, especially from Jurassic 

 strata, resembling those of Phoenicopsis the name Desmiofhyllum^ 

 is employed : these are very similar to those of Pelourdea ; they 

 are characterised by their fairly uniform breadth and afford no 

 indication of their arrangement on the supporting axis. 



Pelourdea vogesiaca (Schimper and Mougeot). 



The linear-lanceolate leaves described by Schimper and 

 Mougeot as Yuccites vogesiacus and transferred by Fliche to 

 Cordaites are probably specifically identical with specimens 

 described by Mr Wills^ from Lower Keuper rocks in Worcester- 

 shire. The English leaves were described by Arber* as Zamites 

 grandis,—th.e name Zamites vogesiacus having been previously 

 used by Schimper and Mougeot, — on the ground that the supposed 

 leaves were probably pinnae of a cycadean frond, a view in 

 agreement with an opinion previously expressed with regard to 

 similar leaves from Stonesfield^. A later discovery by Wills of 

 specimens, on which the drawing reproduced in fig. 484 is based, 

 of the same type of leaf showing the foliar nature of the fossils 

 necessitated the abandonment of the pinna-hypothesis, and the 

 original name Yuccites vogesiacus was resuscitated*. The leaves 

 reach a length of 50 cm. and a maximum breadth of 6-5 cm. ; 

 the lamina is entire, lanceolate or hnear-lanceolate, the apex 



1 FUohe (10) p. 218, PL xx. fig. 2. « See postea. 



3 Wills, L. T. (10), p. 296, fig. 26. * Arber (07) Pis. xvii.— xix. 



* Seward (04) B. p. 111. 6 Arber (09^). 



