486 JOURNAL OF SCIENCE. 
determine even the genus of this ancient fish; but pointed out 
that it appeared to have some points of resemblance to Macro- 
petalichthys of the North American Devonians,. 
Mr. Macleay exhibited specimens of a small Moth (Tineide), 
the larva of which was at present creating great havoc in the 
vegetable gardens in and about Sydney, completely eating up the 
leaves of the cabbages and cauliflowers, and rendering the entire 
crop utterly useless. The Caterpillar, a number of which were 
exhibited, is an active, slightly hairy, green worm, the pupa is also 
ereen and is fastened onthe under side of the leaf on which it has 
fed, by a cocoon of beautiful open lace work, The rapidity with 
which this insect seems to reproduce itself is most astounding, and 
accounts for the short work it makes of a bed of cabbages. The 
insect was, it is said, first noticed last year, and then not in de- 
structive numbers, so that it will probably be found to be an 
importation. | 
Mr. Macleay also exhibited the foetus of Halmaturus rujicollis, 
taken from the pouch of .he mother, with the umbilical cord 
attached, illustrating the extremely early age at which the young 
leave the uterus, 7 
Mr. H. A. Gilliat exhibited a collection of cretaceous tossils 
from the Mount Brown diggings. With reference to this exhibit 
the Vice-President made a few remarks on its value and interest. 
He said that the cretaceous tormation was known to extend 
throughout the whole eastern interior of the Continent, and pro- 
bably through the centre, but not much was known of the fossils. 
The abundance of Avicula alata, Eth., in this collection, showed 
such a wide-spread prevalence of this fossil, that he considered it 
the most characteristic species of the formation, The rock was 
curiously like the Greensand of Europe. The collection contained 
valuable additions to our knowledge of the fauna. 
Mr. J. J. Fletcher exhibited (1.) A specimen of a Giant Earth- 
worm, 25 in. long, from Burrawang, N.S.W._ It probably belongs 
to Prof. M‘Coy’s genus Megascolides, and its existence in this colony 
is now recorded for the first time. (2.) The plates of Dendvolagus 
inustus and D. ursinus from Profs. Schlegel and Miiller’s work on 
the Mammals of the Indian Archipelago, for comparison with the 
specimen of a new species of Dendvolagus exhibited by the Hon. 
Wm. Macleay at the last meeting. (3.) Specimens of the Lizard 
referred to in his paper. 
Professor Stephens exhibited a pebble from Casino, containing 
an included drop of water, which did not entirely fill the space in 
which it was inclosed. The stone was chalcedony, evidently 
washed out of a volcanic rock, in a cavity of which it had been 
formed by infiltration of hydrous silica, the process having been 
in all probability only arrested by the decomposition of the matrix 
and consequent liberation of the nodule. The cavity had been 
first lined by some (probably) geolitic mineral, forming a mammil- 
lary surface, which had been subsequently covered by the inner 
and harder silicious substance, which now enclosed the water ac- 
companied by some gas. The phenomenon is not at all uncom- 
mon, but often escapes notice. 
He also exhibited a Chrysalis of a Danais, secured by a silk line 
to a leaf of an exotic Pelargonium, 
