6 Seward: The Jurassic Flora of Yorkshire. 
Wyke and elsewhere, with those of the recent fern Matonia 
pectinata leaves no doubt as to their close relationship. Simi- 
larly, the genus Laccopteris, the fronds of which, like those of 
Matonidium and Matonia, are characterised by a long stalk 
terminating in long and narrow pinnate branches, bearing linear 
falcate leaflets, is almost certainly another member of the 
Matonineae. This family affords one of several instances of 
plants which, in the Jurassic era, were widely distributed in 
the northern hemisphere and are now confined to a remote 
area in the southern tropics. 
Fic. 2. Matonidium Goepperti (Ett.). From specimens in the British 
Museum, from the Inferior Oolite of Yorkshire. A, B, 4 natural size.* 
Coniopteris hymenophylloides Brongn., etc. The genus 
Coeniopteris stands for ferns which, in their sori and sporangia, 
closely resemble some members of the Cyatheaceae, a family 
which includes the tree ferns of tropical and sub-tropical regions. 
The Cyatheaceae are no longer represented in the floras of 
Europe. 
In Klukia exilis Phill. we have a representative of another 
family, the Schizeaceae, which has disappeared from Europe, 
but exists in North America, India, South Africa, the Malay 
region and elsewhere. 
* Block lent by the Syndics of the Cambridge University Press. 
Naturalist, 
