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 
paleeobotanists may find its proper place among fossil animals.’ 
Schenk’s important contributions,? while correcting the earlier 
work of Dunker and others, supply much additional information 
as to the flora of the German Wealden. Several of Dunker’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,*® in which the following list of Wealden plants is 
given; and this may be taken to represent the species recorded from 
German Wealden rocks up to 1880. 
Fucoiditee ? 
Equisetum Burchardti, Dunk. = Equi- 
setites Burchardti, Dunk. 
Sphenopteris Mantelli, Brong. = Ony- 
chiopsis Mantelli (Brong.). 
S. Gopperti, Dunk. = Ruffordia Gép- 
perti (Dunk.). 
S. delicatissima, Schenk. 
Lomatopteris Schimperi, Schenk. 
Baiera pluripartita, Schimp. 
Pecopteris Dunkeri, Schimp. = Clado- 
philebis Dunkeri (Schimp.). 
P. Murchisoni, Dunk. 
P. Geinitzii, Dunk.* Schenk’s figure = 
Sphenopteris Fittoni, sp. nov. 
Alethopteris Browniana (Dunk.) = 
Cladophlebis Browniana (Dunk.). 
A. Huttoni (Dunk.). 
A. cycadina, Schenk. 
Matonidium  (Laecopteris) 
(Schimp.). 
Gopperti 
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 Lyelli, S. and W.® 
Cycadites Roemeri, Schenk. 
Anomozamites Schaumburgense(Dunk.). 
Pterophyllum Lyellianum, Dunk. 
Dioonites Dunkerianus (Gopp.). 
D. Goppertianus (Dunk.). 
Pachyphyllum curvifolium (Dunk.). 
P. crassifolium, Schenk. 
Abietites Linkii (A. Rmr.). 
Sphenolepis Sternbergiana (Dunk.), 
S. Kurriana (Dunk.). 
Spirangium Jugleri (Ktt.). 
1 Compt. Rend. vol. cvii. 1888, p. 1022. 
* Paleontographica, vol. xix. 1871, and vol. xxiii. 1875. 
3 
Weald. Hannover, p. 44. 
* The existence of Dunker’s Wealden species, P. Geinitzii, seems to have been 
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. Roth. Plauenschen Grunde, 
Abh. k. Sachs. Ges. Wiss. math. phys. Cl. vol. xix. p. 120, 1893. 
° Mantell is given by Struckmann as the author of this species. 
