1 2 
Class — Ganoidei. 
CW«— HETEROCERCI. 
Ohs . — In this order Palcconiscus, Myriolcpis and TJrosthenes are to be 
placed, while about Clcilhrolcpis there are seme doubts whether it is a 
lictcrocereal fish at all. 
Genus — PALiEONISCUS, Agassiz. 
Ohs. — This genus lias been of late years, especially through the works 
of Dr. It. Traquair, more closely defined, and species of it have been placed 
with various other genera, so that I am not quite sure whether the Australian 
species has further to remain with this genus. Por the present, however, it 
does not matter very much whether it really is or is not a Palcconiscus. The 
late Sir P. do M. G. Egerton did describe it as such. So much is certain, that 
it is a ganoid heterocereal hsli, which indeed belongs to the Palseoniscidse. 
Paljeoniscus axtipodeus, Egerton. 
PI. XXX, Pig. 1. 
P. antipodeus , Egerton, Quart. Journ. Geol. Soc., 1864, p. 84, Tab. I, f. 4, and woodcut, p. 5 
(the tail). 
P. antipodeus, Eeistmantel, Palaeoz. it. mesoz. Elora ostl. Australians (Palaeontograpbica, 
1S78, Suppl. Bd. Ill, p. 103.) 
P. antipodeus, Quenstedt, Petrefaktenkundc, 1SS5, 3te Auflage, p. 345. 
Ohs. — I think Sir P. de M. G. Egerton also determined this species from 
photographs. lie could find no difference in this fish from Pcilcconiscus. 
Egerton’ s Tab. I, Pig. 4, is only the body, while on p. 5 there is a woodcut of 
a true lieterocercal tail, which is believed to belong to the same fish ; so that, 
supposing this to be true, even then there could be no doubt about the 
lieterocercal nature of the fish. Later on more complete specimens were 
found, one of which is that now figured. The lieterocercal tail is quite 
distinct and rather powerful, especially with regard to the lower lobe of the 
fm. 
In my original (German) work on the Australian Elora ( loc . cit., 
p. 104), I have given my reasons why the strata, in spite of the occurrence 
of Pahconiscus, can be of Mesozoic age. I quoted the relations of the 
Hawkesbury-Wianamatta beds, further the circumstance that Palcconiscus is 
there rather rare, that it occurs together with other fishes which are not quite 
distinctly lieterocercal, that Palcconiscus also occurs in the Karoo formation 
of South Africa, and that Palcconiscus and other lieterocercal species occur 
in Mesozoic formations elsewhere. I quoted, amongst others, Palcconiscus' 
