152 Prof. von Ettingshausen—Ceratozamia in Styria. 
Another distinctive character in Pleurodictywm—which I have recently 
determined by an examination of well-preserved specimens from 
the Corniferous Limestone of North America—is that in this genus 
the basal epithecal plate is pierced by numerous well-marked 
foramina, formed by the external openings of the mural pores of 
the marginal corallites. It is probable that this character will be 
found to be constant in the genus Pleurodictyum, but I am not at 
present in a position to affirm that it is so. 
The genus Cleistopora, Nich., may be defined as follows :— 
Corallum small, discoid, usually attached by its entire base to 
foreign bodies. Corallites short, prismatic, without tabule, and 
having the inferior portion of the visceral chamber completely filled 
up with loosely reticulate calcareous tissue. Septa represented by 
strie only. Walls thick, traversed by minute irregular canals or 
pores. 
The specimens of Cleistopora geometrica, EK. & H. sp., which I 
have examined, were collected by be Daniel Gihlert in the Devonian 
rocks of Viré, France. 
IJJ.—Own THe Occurrence oF A CERATOZAMIA IN THE TERTIARY 
Fiora or Lrospen 1N STYRIA. 
By Dr. Constantin Baron yon Errinesuausen, F.C.G.S., 
Professor of Botany, University of Graz, Austria. 
7% ADOLPH HOFFMANN has kindly sent me a large series 
of fossil plants from the Tertiary strata of Leoben containing 
a very rich fossil flora. On examining the latter, I discovered a 
fossil leaf, which I at once recognized as a Cycad. 
Remains of that family of plants are extraordinarily rare in the 
Tertiary strata of Europe. They are limited almost entirely to the 
Eocene formation. The occurrence, therefore, of such a fossil in the 
Tertiary flora of Leoben, which belongs to the Miocene period, calls 
forth the greatest interest, and I shall not fail to give a preliminary 
notice on the subject to paleontologists. 
The leaf-fossil resembles very much the leaf of Ceratozamia, a 
Mexican genus. It shows lanceolate-linear segments which are 
narrowed towards both ends and somewhat falciform. The borders 
are not toothed. The segments are 17 centimetres long and 174 milli- 
métres broad. The texture is firm, coriaceous. The nervation con- 
sists of 16 longitudinal nerves, being equally thin and undivided. 
They are rather prominent. The epidermis is well preserved and 
shows stomata which, relating to form and position, agree very closely 
with those of Ceratozamia. 
Though I do not doubt that the fossil here described is a Oycad, 
it is well to take into consideration other possible determinations. 
In the first place there are the Coniferee to be named to which the 
above fossil may be referred, especially the genus Dammara. But 
the leaves of the Dammara-species are simple, not divided, and 
relatively broader than the segments of the fossil in question, though 
structure and nervation do not differ in either. On account of the 
