INIEODUOTION. 21 



the fullest account of the Jurassic plants of France. Some of the 

 figures in Saporta's monograph are reproduced from drawings 

 originally prepared for Brongniart, and these enable us to recognize 

 certain species whioh are mentioned but not described in the 

 Prodrome and the Tableau. Several of the specimens figured in 

 Saporta's volumes are in the Museum of Natural History and 

 in the School of Mines, Paris ; an examination of some of the 

 type-specimens impressed upon me the need of considerable caution 

 in drawing conclusions from the figures alone, many of which are 

 far from accurate. In the following list only such plants are 

 included as present a close reseniblance to East Yorkshire species, 

 or agree approximately in age with the British species. Several 

 species of Sphenopteris, Scleropteris, Cladophhhis, and other ferns 

 have been omitted, as they are often founded on fragmentai'y 

 and insufficient material. Most of the strata from which the 

 Jurassic plants of France have been obtained are of marine origin. 

 Among the most important localities from the point of view of a 

 comparison of the French and English species are Mamers 

 (Bathonian), D'Etrochey (Combrash), and Chateauroux (Corallian), 

 in the departments of Sarthe, Cote d'Or, and Indre respectively. 

 The numerous fossils referred by Saporta to Algse need not be 

 considered; they have no representatives in the Yorkshire beds, 

 and most of them have in all probability no claim to be included 

 in the plant kingdom. 



Vol. I. 1873. 



lEqmsetum Suvalii, Sap., p. 248, pi. 30, figs. 1-4 (Bathonian) ; cf. Bquisetites 



colmnnaria, Brongn. 

 Sphenopteris Pellati, Sap., p. 278, pi. 31, fig. 1 (Kimmeridgian) ; of. Cmiopteris 



hymenophylloides (Brongn.). 

 Coniopteris conferta, Sap., p. 289, pi. 31, fig. 3 (Corallian) ; cf. Coniopteris 



hymenophylloides (Brongn.). 

 Mierodictyon rutenicum, Sap., p. 309, pi. 33, figs. 2-4, and pi. 44 (Bathonian) ; 



cf. Laecopteris Woodieardi (Leek.). 

 M. Woodivardicmum, Sap., p. 313, pi. 33, figs. 5-7 (Bathonian) ; ^Laecopteris 



Wbodwardi (Leek.). 

 Stachypteris litophylla, Sap., p. 387, pi. 50 (Corallian) ; of. (pars) Coniopteris 



quinqueloba (PhiU.). 

 Zomatopteris Moretiana, Sap., p. 396, pi. 51, figs. 4-6; pi. 62, figs. 1-5 



(Bathonian). (Also other species of Zomatopteris, which do not appear to 



be represented in the East Yorkshire flora.) 

 Tceniopteris vittata, Brongn., p. 444, pi. 64, figs. 1-5 (Rhatic) ; = ? Z vittata. 



