516 



CYCADOPHYTAN FRONDS 



[CH. 



hensive species should be included the specimens described by 

 Feistmantel as Otozamites Hislopi (fig. 589), 0. angustatus, and 

 0. gracilis. It may well be that a more detailed investigation 

 of the numerous forms comprised in this protean species, parti- 

 cularly if specimens are obtained from which cuticular pre- 

 parations can be made, may lead to the recognition of additional 

 species or well-defined varieties. The resemblance between the 



A B 



FIG. 589. Ptilophyllum pecten. A frond figured by Feistmantel as Otozamites 

 Hislopi. A, f nat. size; B, enlarged (Calcutta Museum). 



various forms of P. pecten from the Jurassic strata of Yorkshire 

 and those of P. cutchense from India is very striking, and at least 

 in many cases no specific separation is possible so far at least as 

 the form of the fronds and pinnae is concerned. The occasional 

 close association of Ptilophyllum fronds and Williamsonia flowers 

 is an important agreement between the English and Indian fronds 

 (fig. 590). 



In the first part of the Catalogue of Jurassic plants from York- 



