AUTHOR'S PREFACE. 



Specimens of Jurassic plants from Gristhorpe Bay and 

 other famous localities on the Yorkshire coast are met 

 with in nearly every Museum in Britain, as well as in 

 several continental collections. I have endeavoured to 

 supplement the data afforded by the specimens in the 

 British Museum by examining collections in other places : 

 frequent allusion will be found in the descriptive part of 

 this Catalogue to important types in provincial or continental 

 museums. The Museums of Cambridge, Oxford, York, 

 Scarborough, Whitby, Manchester, Newcastle, and Leeds 

 are rich in Yorkshire Coast plants, and good collections 

 have been examined also in Paris, Stockholm, Lund, and 

 elsewhere. The British Museum series and the Leckeuby 

 Collection in the Geological Museum, Cambridge, are 

 probably the richest in large and well-preserved specimens, 

 but the other museums, especially those of Scarborough, 

 Whitby, York, and Manchester, contain much material of 

 considerable value. The identification of type-specimens 

 has often been a difficult task : some of the specimens 

 are probably lost ; many have suffered considerably, partly 

 through insufficient care having been exercised in their 

 preservation and, to some extent, as the result of the 

 natural breaking up of the shale in which the fossils 

 occur. My search for type- specimens, which has often been 



