SILURIAN BIVALVED SEL EBS ES OF VICTORIA. 
Silurian for the first time, whilst 14 genera are new to Aus 
tralia. These newly recorded genera are—Palaanatina, Car- 
diola, Panenka, Paracardium, Pralucina, Cienodonta, Nucu- 
lites, Nucula, Parallelodon, Actinodesma, 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 bivalved fauna of the Australian Silurian. 
When our knowledge of this group and of the remainder of the 
molluscan classes is more complete, it will be 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. 
Paleanatina, J. Hall.—Hitherto found only in the Upper 
Devonian of North America. 
Cardiola, Broderip.—This is a Silurian genus in Great 
Britain; and it also occurs in the Silurian and Devonian in 
Eastern Europe. It appears to be 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. 
Prelucina, 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,, but in the Upper Silurian 
Ee, there occur 25 species, whilst in the lowest zone of the 
Devonian, Ff, 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 
America. 
Nucula, Lamarck.—This genus ranges from Silurian to 
Recent. Probably many of the British Silurian species now 
referred to C'tenodonta may prove eventually to belong to this 
genus. Although originally described as species of Nucula, 
some of these fossils appear to have been transferred to Cteno- 
donta, on insufficient evidence of the hinge characters.* 
Parallelodon, Meek and Worthen. It is interesting to 
record this genus from the Silurian of Victoria, since it had an 
already- known range from the Devonian to Tertiary. 
* Compare remarks by J. L. Tobley, on « Paleozoic Ar idx,’ Proc. Geol, Assoc., Vol 
X., No. 8, 1888, p. 402. 
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