Upper Silurian.] PALAONTOLOGY OF VICTORIA. [Mollusca. 
This very large, rapidly tapering, handsome, species at first sight 
recalls the English O. filoswm of the Lower Ludlow rocks, but is 
at once distinguished by the rows of ovate tubercles between the 
lines. Count Miinster originally described it as common in the 
Upper Silurian rocks of Elbersreuth, and M. Barrande has since 
found it in the Bohemian Upper Silurian limestones of Kozorz and 
Lockhow, near Prague; but I have never heard of it elsewhere 
until recognising it in the strata of the same age in the colony of 
Victoria. 
Very common in the Upper Silurian olive mudstones of the age 
of the Wenlock shale at McMahon’s Creek, Upper Yarra; in similar 
beds at Reefton, Warburton. 
EXPLANATION OF FIGURES. 
Plate LVI.—Fig. 7, fragment, natural size, from Reefton. Fig. 7a, portion magnified to 
show the row of tubercles as appearing on a cast. Fig. 8, portion of another specimen 
magnified to show the granulation seen on the ridges on some impressions of inner layers. 
Freperick McCoy. 
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