224 MR. HAMSHAW THOMAS OX THE FOSSIL FLORA OF [June I913, 



The species described in this paper are those that can be 

 identified with a considerable degree of certainty. The collections 

 mentioned above also contain specimens of other forms, which 

 cannot at present be identified with any confidence. These must 

 await the discovery of further material before they are described. 

 The plants described were nearly all found at Marske. The 

 recently discovered plants from Eoseberry Topping will form the 

 subject of a later paper. 



My thanks are due to the Rev. G. J. Lane, Mr. T. W. Saunders, 

 and Mr. F. Elgee ; also to Dr. Halle, Prof. JSTathorst, and especially 

 to Prof. A. C. Seward for assistance and advice of various kinds. 

 I am also indebted to the Marquis of Zetland for permission to 

 excavate in the Marske quarries. 



Some of the expenses incidental to the present work have been 

 defrayed from grants made by the British Association (Committee 

 for the Study of the Jurassic Flora of Yorkshire), and also from 

 the Gordon-Wigan Fund of the University of Cambridge. 



II. Historical 2\otes. 

 The collection of plants from the Marske Quarry seems to have 

 been commenced by the late Rev. J. Hawell, whose specimens are 

 now in the Middlesbrough Museum. These plants were for the 

 most part impressions in fine-grained ironstone, and were often 

 very well preserved. Among them were some examples of a species 

 of Dictyozamites, which was described by Prof. Seward 1 in 1903. 

 In 1909, the Ptev. G. J. Lane 2 recorded the discovery of Equisetites 

 eolumnaris, Otozamites graphicus, Baiera lindleyana, and Zamites sp. 

 The same author, with Mr. T. W. Saunders, published the first 

 complete list of species in 1909, 3 which was as follows : — 



Equisetites eolumnaris. 



Equisetites beani* 



Zycopoditcs.* 



Tceniopteris major. 



Tceniopteris vittata. 



■Sagenopteris ph illipsi. 



Cladophlcbis denticulata. 



Cladophlebis haiburnensis [Toditcs 



williamsoni Br.]. 4 

 Laccopteris polypodioides. 

 Base of flower of Wittiamsonia. 

 Fructification of Wittiamsonia. 

 Wittiamsonia gigas. 

 Wittia mson ia pecten. 

 Otozamites beani [? Dictyozamites 



hawelli Sew.]. 

 Otozamites grctphicus. 



Otozamites feidmanteli. 



Nilssonia. co?npta [JV. mediana Leek.]. 



yUssonia mediana. 



Xilssonia tenuinervis [K orientalis 



Heer]. 

 Dieti/ozamites hawelli. 

 Ginkgo digitata. 



Baiera gracilis [B. longifolia Pom.]. 

 Baiera phillipsi* 

 Baiera lindleyana.^ 

 CzcJcan owskict murrayana. 

 Bcania gracilis* 

 Araucarites sp.* 

 Pagiopliyllum williamsoni [cf. E. 



setosct]. 

 Braehyphyllum mammillare* 

 Chcirolepis setosus. 



Otozamites parallelus [Wittiamsonia 

 pecten Phill.]. 



An asterisk (*) indicates that no conclusive evidence has been found 

 for the existence of the species thus starred. 



J Q. J. G-. S. vol. lix (1903) p. 217. 



2 Proc. Cleveland Naturalists' Field-Club, vol. ii, pt. 3, p. 172. 



3 ' The xVaturalist ' 1909, p. 81. 



4 The names in brackets are those adopted in the present pnper. 



