8 S¥.\\ARD, Jurassic P/attts in the MancJiester Musciini. 



Coiiioptcris to some of the Jurassic species of ferns in 

 preference to the use of recent generic names such as 

 Dickso7iia or TJiyrsoptcris. An examination of a large 

 number of specimens (>f Lower Oolite Sphenopteroid 

 fronds has led me to include SpJioioptcris arguta of Lindley 

 and Hutton, and several other 'species,' as synonyms 

 of Conioptcris IiyvtenopJiylloides (Brongn.). To discuss 

 fully the reasons for using Brongniart's specific designa- 

 tion in the comprehensive sense in which I have employed 

 it would extend these notes beyond reasonable Hmits, the 

 main object of this paper being to draw attention to certain 

 important specimens in the Manchester Museum, and to 

 express opinions as to their systematic position. 



Todiies Willimiisoni (Brongniart). 

 PI. i., figs. I and 2} 



Type-specimens of pl. clxix., figs, i and 2 (Nos. 44 and 45). 



1828. Fecoptcris Williavisonis, ^xox\g\\\-A.x\., Hist.Vcg. Foss., 



p. 324, pl. ex., figs. I, 2. 

 P. Whitbiensis, ibid., pl. ci.x., figs. 2-4. 

 F. tenuis, ibid., p. 322, pl. ex. figs. 3, 4. 



1829. Fccopteris receutior, Phillips, Geol. Yorks., p. 148, 



pl. viii. fig. I 5. 

 ? P. Juistata, ibid., pl. viii., fig. 1 7, 

 F. curtata, ibid., p. 148, pl. viii., fig. 12. 

 1833. Neuropieris receutior, Lindley and Hutton, Foss. Flora, 

 pl. Ixviii. 

 Fecoptcris Willianisonis, ibid., pl. cxxvi. 



1835. Fecoptcris dcntata, ibid., pl. clxix. 



1836. Acrostichites Willianisonis, Goppert, Foss. Farm.., 



p. 285. 

 Alethoptcj'is dcntata, ibid., p. 306. 



' The upper figure in Pl. i. is referred to as fig. I. 



