INTRODUCTION. 



XIX 



that it should necessarily be included in the list of "Wealden plants; 

 very possibly, as Zeiller and Renault have shown, this puzzle to 

 palaBobotanists may find its proper place among fossil animals. 1 



Schenk's important contributions, 2 while correcting the earlier 

 work of Dunker and others, supply much additional information 

 as to the flora of the German Wealden. Several of Bunker's 

 species are found by Schenk to have no claim to stand as such, 

 but are shown by the more perfect material collected since 1846 

 to be fragments of different portions of one and the same species. 



Following the two papers by Schenk we have a useful Monograph 

 by Struckmann, 3 in which the following list of Wealden plants is 

 given; and this maybe taken to represent the species recorded from 

 German Wealden rocks up to 1880. 



Fucoiditeee ? 



Equisctum Burchardti, Dunk. = Equi- 



setites Burchardti, Dunk. 

 Sphenopteris Mantelli, Brong. = Ony- 



chiopsis Mantelli (Brong.). 

 S. Gopperti, Dunk. = Rt<,ffordia Gdp- 



perti (Dunk.). 

 S. delicatissima, Schenk. 

 Lomatopteris Schimperi, Schenk. 

 Baiera pluripartita, Schimp. 

 Ptcopteris Dunkeri, Schimp. = Clado- 



phlebis Dunkeri (Schimp.). 

 P. Murchisoni, Dunk. 

 P. Geinitzii, Dunk. 4 Schenk's figure = 



Sphenopteris Fittoni, sp. nov. 

 Alethopteris Browniana, (Dunk.) = 



Cladophlebis Browniana (Dunk.). 

 A. Huttoni (Dunk.). 

 A. cycadina, Schenk. 

 Matonidium (Laccopteris) Gopperti 



(Schimp.). 



Laccopteris Dunkeri, Schenk Micro- 



dictyon Dunkeri (Schenk). 

 Sagenopteris Mantelli (Dunk.). 

 Hausmannia dichotoma, Dunk. 

 Marsilidium speciosum, Schenk. 

 Jeanpaulia Brauniana, Dunk. 

 Tempskya Schimperi, Corda. 

 Protopteris Witteana, Schenk. 

 Clathraria Lyetti, S. and W. 5 

 Cycadites Roemeri, Schenk. 

 AnomozamitesSchaumburgense(D\n\k.). 

 Pterophyllum Lyellianum, Dunk. 

 Dioonites Dunkerianus (Gopp.). 

 D. Goppertianus (Dunk.). 

 Pachyphyllum curvifolium (Dunk.). 

 P. crassifolium, Schenk. 

 Abietites Linkii (A. Emr.). 

 Sphenolepis Sternbergiana (Dunk.). 

 S. Kurriana (Dunk.). 

 Spirangium Jugleri (Ett.). 



1 Compt. Eend. vol. cvii. 1888, p. 1022. 



2 Palaeontographica, vol. xix. 1871, and vol. xxiii. 1875. 



3 Weald. Hannover, p. 44. 



4 The existence of Dunker' s Wealden species, P. Geinitzii, seems to have heen 

 overlooked by Gutbier and others, who make use of the same name for a Permian 

 fern of a different character. e,g. See Sterzel, Flor. Koth. Plauenschen Grunde, 

 Ahh. k. Sachs. Ges. Wiss. math. phys. Cl. vol. xix. p. 120, 1893. 



5 Mantell is given by Struckmann as the author of this species. 



