6 Sew ARV), /nrnsstc Pla)its in the ]\lanclicstcy Mnseiun. 



1 85 1. Sp/ienopteris ncpJirocarpa, Bunbur}% Quart. Joufii. 



Geol. Soc, vol. vii., p. 179, pi. xii., figs, in and id. 

 1873. SpJicnopteris Pcllati, Saporta, Pal. Franc., vol. i., 



pi. xxxi., fig. I, p. 278. 



1875. Sphcnoptcris affinis, Phillips, Gcol. Yorks., p. 213, 



lign. 30, 

 S. dissocialis, ibid. p. 214, lign. 32. 



1876. Thyrsopteris Murrayana, Heer, Flora Foss. A ret., 



vol. iv. (ii.), p. 30, pi. i., fig. 4 ; pi. ii., figs. 1-4 ; 

 pi. viii., fig. 1 1/;. 

 T. inaakiatia, ibid., p. 31, pi. i., figs. 1-3, and figs. 

 5 and 6. 

 1878. Dicksonitcs clavipcs, ibid., vol. vii., p. 33, \)\. ii., fig. 7. 

 1892. Dicksonia Heerii, Raciborski, /^A-tc? Krakozv.,^^. 1^4, 

 pi. X., fig.s. 5-14. 

 D. .':arccf:nyi (pars), ibid., p. 175, pi. xii., figs. 8, 9, 

 1 1, and 12. 



I'ig. I. Coniopteris hymenophyllcides {\\\ox\^x\.), (nat. size). 



It is extremely difficult to decide how best to deal 

 with the numerous examples of Sphenopteroid fronds 

 afforded by the Yorkshire plant-bearing strata ; they are 



