xxxix] 



PTILOPHYLLTJM 



517 



shire the opinion was expressed^, based on an examination of 

 Morris's type-specimen of Ptilophyllum cutchense and of a large 

 number of English and other fronds identical with or closely- 

 allied to Pterophyllum pecten Lind. and Hutt., that the Indian 

 and European fronds belong to the same genus. In a later paper^ 

 it was maintained that P. cutchense and P. acutifolium are probably 

 identical vith the English type, and a drawing was published — 

 reproduced in fig. 591 — of Morris's type-specimen. Dr Halle* 

 has discussed the genus Ptilophyllum and his investigations lead 

 him to a different conclusion ; he, like Zeiller and some other 



Fig. 590. Ptilophyllum pecten {P. cutchense) and Williamsonia Blanfordi. [Drawn 

 from a specimen figured by Feistmantel (76^) PI. xn. fig. 6.] 



authors, employs Ptilophyllum in Feistmantel's sense. The 

 pinna-base is said to agree in its asymmetrical form with that in 

 Otozamites, while it differs from the symmetrical base of Zamites 

 pinnae. In Ptilophyllum both edges of the pinna-base are said 

 to bend down in joining the rachis; at the upper corner the base 

 thus becomes rounded and for some distance free from the rachis ; 

 it is also sometimes a little auriculate ; at the lower edge the pinna 

 is decurrent on the upper surface of the rachis. In a subsequent 

 1 Seward (00) B. p. 193. ^ md. (03) p. 227. ^ HaUe {13'). 



