INTRODUCTION. 1 3 



Tympanophora simplex, L. & H. } = Coni (eris k y menoph y ttoides (Brongn.). 



T. racemosa, L. & H. ) 



Sphenopteris modesta, Leek., ex Bean MS. (Type in the Leckenby Coll.) 



= Sphenopteris princeps, Presl. 



S. Jitgleri, Ett. (Type in the Leckenby Coll.) = Ruffordia Goepperti (Dunk.). 

 Neuropteris arguta, L. & H. (Figured specimen in the Leckenby Coll.) 



= Conic,pteris arguta (L. & H.). 

 Pecopteris polydactyla, Gopp. (Figured specimen in the Leckenby Coll.) 



= Matonidium Goepperti (Ett.). 



Phlebopteris propinqua (L. & H.). = Laccopteris polypodioides (Brongn.). 

 Phlebopteris Woodwardii, Leek. (Type in the Leckenby Coll.) = Laccopteris 



Woodwardi (Leek.). 

 Fucoidet erectus, Leek., ex Bean MS. (Type in the Leckenby Coll. ; refigured, 



Seward (98), p. 233.) = Marchantites erectus (Leek., ex Bean MS.). 



The writings of Morris, 1 Carruthers, 2 Starkie Gardner, 3 and 

 others contain scattered references to descriptions of Lower Oolite 

 plants ; several species of the British Jurassic flora are dealt with 

 also by Saporta 4 in his Monograph on the plants of this period. 



The most important of the more modern contributions to our 

 knowledge of the Jurassic plants of England is unfortunately 

 written in the Swedish language, and ia not accompanied by any 

 illustrations. In 1880 Nathorst 5 published a series of notes on his 

 visits to various English Museums, together with observations 

 made in the field at some of the principal plant localities on the 

 Yorkshire coast. The same author discovered a new plant-bed 

 between White Nab and Scarborough, which enabled him to add 

 some new species to the Lower Oolite flora. Nathorst's notes 

 have proved of considerable value in the examination of the 

 Yorkshire plants, and his opinions on the several species are 

 frequently referred to in the descriptive part of this Catalogue. 

 The following new species are mentioned or briefly described, 

 but in some cases I have been led to identify them with species 

 previously recorded. Whether or not Nathorst's supposed new 

 species should be retained, there can be no question as to the 

 great value of his critical notes. 



Anthrophynpsis, n.sp. = Ctenis, sp. 



Nihionia tenuinervis, n.sp. = Nilssonia tenuinervis, Nath. 



1 Morris (41). 



2 Carruthers (66) (67) (69 1 ) (69 2 ) (70). 

 s Gardner (86). 



Saporta (73) (75) (84) (91). 

 5 Nathorst (80). 



