228 



JMR. A. C. SEWARD ON THE 



[May 1903, 



fronds, is dealt with more fully in my Jurassic Catalogues, from 

 which one sentence may be quoted : — 



' A^careful examination of Morris's type-specimen of Ptilophyllum cutchense 

 (in the Museum of the Geological Society of London), and of several other 

 Indian specimens in the British Museum, has convinced me that a generic 

 separation of the Indian and European fossils serves to mislead, and indicates a 

 distinction which does not exist.' 1 



Morris's type-specimen is represented in the accompanying figure, 

 approximately three times the natural size. As regards the arrange- 

 ment of the pinnae and the form of their bases, the specimen presents 

 the closest agreement with Williamsonia pecten. In some fronds of 



W. pecten the pinnae 



Ptilophyllum cutchense of Morris have broader bases, 



[=7 Williamsonia pecten (L. & H.)]. ( x 3.) with the upper edge 



more or less auri- 

 culate ; a similar 

 variation is seen also 

 in the Indian fronds. 2 

 The following defi- 

 nition of Ptilophyl- 

 lum as given by 

 Morris contains 



nothing that is not 

 equally applicable to 

 the fronds of Wil- 

 liamsonia pecten : — 



' Fronds pinnate, 

 pinnae closely approxi- 

 mated, linear, lanceo- 

 late, more or less elon- 

 gate, imbricate at the 

 base, attached obliquely ; 

 base semicircular or 

 Type-specimen rounded; veins equal, 



(Geological Society's Museum, No. 9941.) sleilder ' P aralle1 -' 3 



Bornholm. 



The flora described by Bartholin, and more recently by Dr. M oiler, 

 includes several English types from Inferior-Oolite rocks, but the 

 occurrence of other forms identical with, and closely allied to, 

 Liassic and Hhaetic species leads me to assign it to a somewhat 

 lower horizon than that of the Yorkshire plant-beds. 



The foregoing lists do not include any of the extra-British plants 

 which cannot be closely matched by species from the Yorkshire 

 strata as tabulated in the first column. If we examine the complete 

 lists of Japanese, Indian, and Bornholm plants, disregarding such 



1 Seward (00 3 ) p. 193. 



2 See Feistmantel (76) pis. i-iv, and Seward (00 3 ) pi. iii & text-figs. 31-34. 



3 Morris (40) expl. of pi. xxi. 



