The Jurassic Plant Beds of Roseberry Topping. 199 
leaves, while in other places beautiful pieces of Ctenozamites 
fronds are seen. This same type of distribution is seen at 
Gristhorpe and in other plant beds, and it is very important 
for the collector to remember that by working along the zone 
for a few yards he may possibly come across new plants. Of 
course this type of distribution is probably what we should 
expect to find in beds laid down under estuarine conditions. 
The fossil flora of the Roseberry series is a rich one, and the 
following is a provisional list of the species already discovered : 
Equisetites Beant (Bunb.). Taentopterts sp. \new]. 
Sagenopterts Phillipst var. major Nilssonta mediana (Leck. ex Bean 
Seward. MS.). 
Laccopteris polypodioides (Br.). Nilssonia ovientalis Heer. 
Dictyophyllum rugosum (L. & H.). Ctenis sp. (cf. falcata L. & H.). 
Hausmannia sp. Pseudoctenis Lanet Thomas. 
Cladophlebis, denticulata (Br.). Ctenozamites Lechkenbyt (Leck. ex 
Cladophlebis sp. Bean MS.). 
? Todites Williamsoni (Br.), [sterile]. . Thinnfeldia sph. (cf. vhomboidalis 
Marattiopsis anglica Thomas. Ett.). 
Ptilophvilum (Williamsonia) pecten Thinnfeldia sp. (cf. incisa Sap.). 
(Phill.). Bateva longifolia Heer. 
Zamites (Williamsonia) gigas. L. Ginkgo sp. (ct. lepida Heer.). 
canst Ginkgo digitata (Br.). 
Anomozamites (Wielandiella) Nils.  ? Czekanowskia Murvavana (L.&H.). 
sont (Phill.). Coniferous twigs (E/atides), with 
Taentopteris vittata Br. 5 and © cones. 
The above list has been drawn up in the field, and is only 
meant to give some idea of the flora. A number of the forms 
mentioned will have to be critically examined later. 
In its general characters this flora is very distinct from any 
Yorkshire Mesozoic flora previously described. The most 
abundant plants are Equisetites Beani, Nilssonia mediana, 
Marattiopsis anglica, and Thinnfeldia, which nowhere else 
are dominant plants. While possessing considerable similarity 
to the flora of the Marske Quarry, Dictyozamites, which is so ~ 
characteristic of that locality, is apparently entirely absent 
here. It is also noticeable that several of our most important 
plants are distinctly Liassic in character. The Thinnfeldias, 
_are most common in deposits of Liassic age, while Marattiopsis 
is a genus which is abundant in the Rhaetic and Lias of 
South Sweden and Germany. 
Among the plants specially worthy of notice stands Mar- 
attiopsts anglica, which I have recently described* for the 
first time from Marske. Fine specimens of its long pinne are 
often to be found, while fertile specimens showing the long 
synangia running along the veins are not uncommon. It is 
at first difficult to distinguish the sterile pinne from the 
fronds of Taentopteris vittata, but they may be soon recognized 
* The Naturalist, 1913, p. 123. 
1913 May. 
