1863..
EGERTOX 1CI1THYOUTES FKOM NEW SOUTH WALES.
5
Coal-measures (there is good evidence of a third), and nine from
the Permian system. Palceoniscus and Pyc/opterus are common to
Europe and America; but Acrolepis and Platysomus have not yet
been recorded beyond the confines of Europe, unless some of the
Kussian species may be from the Asiatic territories of that empire.
Taking the four genera in combination, the localities in which they
are associated in greatest numbers are the Kupferschiefer beds of
Richelsdorf and Mansfeld

they also occur in considerable numbers
in our own Magnesian Limestone

but when we descend into the
Coal-measures, although Palceoniscus is abundant and Platysomus
not scarce in some localities, Pyc/opterus is partial in occurrence,
and Acrolepis so scarce that I have only seen it from one locality,
namely, Carluke in Lanarkshire

so that I know of no one locality
of Coal-measure age in which they simultaneously occur.
Postscript. — Since the above notice was written I have received a
letter from Mr. Clarke, dated April 7, 1863, in which he says,
" The Fish with heterocercal tail like Palceoniscus comes from my
Wianamatta beds, which are above the beds with the Cockatoo Island
Fish, and therefore fully from 1000 to 2000 feet above the Coal-
beds at Newcastle in which the Urosthenes was found." — " The
sequence of beds is this

—
- " — = Wiauatnatta beds (Palceunisc-us, &c).
= ^

^

^1R ^ ^^H1E Cockatoo beds (Cleithrulepis and Myriolepis).

z Hawkesbury rocks.
Coal-seams (Urosthenes).
Marine beds with Coal-seams.
Plants, considered to be Oolitic Dy Prof. M'Coy, occur throughout.
.P. M. G. E..
EXPLANATION OF PLATE I.
Fig. 1. Myriolepis Clarkei, Eg. From a photograph. Nearly two-thirds the
natural size.
2. Cleithrolepis granulahis, Eg. From a specimen. Natural size.
3. Cleithrolepis granulatus, Eg. From a photograph. Kather more than
one-half the natural size.
4. Palceoniscus antip.jdcu$.~Kz. From a photograph. One-half the natural