170 
Geology of Sydney. 
Besides these divisions, there are fossil ferns which 
clearly belong to existing families, and are classified 
with them. It is, however, rarely that we meet with 
such plant remains, and they must generally be iden- 
tified by the fructification. 
A number of plants other than ferns constantly 
Fig. 42. — Tceniopteris Daintreii, 1 McCoy. A Triassic Fern. 
associated with our Coal Measures and Triassic rocks 
may be simply classified as follows : — 
Equisetum . — Leaves united in an entire persistent 
sheath round the stem, which never form themselves 
into separate leaves ; divisions ribbed or smooth. A 
specimen is known from the Hawkesbury Sandstone. 
Schizoneura . — Leaf sheath very long, and in its 
1 Quart. Jour. Geol, Soc. Vol. XXVIII, Plate xxvii. 
