SILURIAN RIVAL VED MOLLUSCA OF VICTORIA. 
Silurian for the first time, whilst 14 genera are new to Aus- 
tralia. These newly recorded genera are — Palceanatina , ( ar - 
diola, Panenka, Paracardium, Prcelucina , Ctenodonta, \ ucu- 
lites, Nucula , Parallelodon , Actinodesrna, Lunulicardium , 
Mytilarca, Glossites and Cypricardinia. 
The following notes on the above-named genera are com 
piled in order to show how interesting is the question of the 
distribution of the bivalvecl fauna of the Australian Silurian. 
When our knowledge of this group and of the remainder of the 
molluscan classes is more complete, it will he possible to make 
some valuable deductions as to the general relationship of this 
widely distributed phylum of the animal kingdom, both from 
geological and geographical stand-points. 
Palceanatina, J. Hall.— Hitherto found only in the Upper 
Devonian of North America. 
Car diola, Broderip.— This is a Silurian genus m Great 
Britain; and it also occurs in the Silurian and Devonian in 
Eastern Europe. It appears to lie absent from North America, 
although the somewhat closely associated genus, Panenka , is 
found there in Devonian strata. 
Panenka, Barrande, is both a Silurian and Devonian genus, 
but attains its maximum development in the latter formation. 
Paracardium, Barrande.— This genus occurs in the Silurian 
(Stage E) in Bohemia, and in the Devonian of North America, 
Prcelucina, Barrande. — A well-defined generic group in the 
Silurian and Devonian of Bohemia. Barrande notes the total 
absence of the genus in the Stage Ee 15 but in the Upper Silurian 
Ee/ there occur 25 species, whilst in the lowest zone of the 
Devonian, Ef, there are only two species. 
Ctenodonta, Salter, is already known elsewhere from the 
Silurian, and its range extends to the Carboniferous. 
Nuculites , Conrad.— A Silurian and Devonian genus, well - 
represented in the Devonian of South Africa and South 
\rnGncR 
Nucula, Lamarck. — This genus ranges from Silurian to 
Recent. Probablv many of the British Silurian species now 
referred to Ctenodonta may prove eventually to belong to this 
oenus Although originally described as species of A ucula, 
some of these fossils appear to have been transferred to Cteno- 
donta on insufficient evidence of the lunge characters.* 
Parallelodon, Meek and 4\ or then. — It is interesting to 
record this oenus from the Silurian of Victoria, since it had an 
already-known range from the Devonian to Tertiary. 
* Compare remark? by T- L. Lobley, on 
X., No. 8, 1 888 , p. 4 0J - 
“ Paleozoic Arcidse,” Proc. Geol. Assoc., Vol 
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