Age of Norseman Limestone, Western Australia. 321 
pagodula, Tate, the ornamentation in these seems to resemble that of 
Tate’s species, which is recorded from Beaumaris, Horsham, and the 
Gippsland Lakes (‘Tate and Dennant’s Upper Oligocene and Miocene). 
A lamellibranch seems to have the ornamentation of Dosinia 
(D. Johnstoni ? Tate), which ranges from Tate and Dennant’s Middle 
Oligocene to Miocene. I do not like the suggested Pleistocene age 
for these shells. They may be Pliocene equivalent to the Glenelg R. 
and Moorabool Viaduct beds of Victoria.” 
_ The specimens include several Bryozoa of which the preservation 
is imperfect, but by the aid of enlarged photographs of some of the 
specimens a fairly probable identification of five species is possible. 
Fic. 1. Yocecia of three Bryozoa from the Norseman Limestone. X 6 diam. 
,, la. Cellaria rigida, McG. 
», 10. Macropora clarkei (Ten.-Wds.). 
», le. Schizoporella convexa, McG. 
The specimens, however, are so corroded that it is only by piecing 
together the evidence of several of the zoccia that sufficient material 
for identification is obtained. The species that are thus provisionally 
determinable are as follows :— 
 Membranipora delicatula (Busk); Miocene, Victoria; Pliocene and 
- Recent. 
Cellaria rigida, McG.; Miocene and Recent. 
Schizoporella convera, McG.; Miocene, Victoria. 
Macropora clarket (Ten.-Wds.); Miocene, Victoria. 
Schismopora modesta, McG.; Miocene, Victoria. 
M. delicatula was founded on Pliocene material, and both it and 
Cellaria rigida still live on the coasts of Australia. The three 
other Bryozoa, of which the identification is more satisfactory, are 
typical Victorian Miocene species. Schizoporella convexa was founded 
by McGillivray on material from Muddy Creek, Victoria. All the 
five species occur in the Victorian Miocenes, and though no positive 
opinion can be expressed on s0 short a list of fossils, their evidence is 
in favour of the Miocene rather than of the Pleistocene age of the 
Norseman Limestone. The material agree more closely with the 
Miocene of Victoria than with the Pleistocene. The specimens, 
however, encourage the hope that more extensive collecting at 
Norseman would yield sufficient fossils to settle the age of this very 
significant limestone. 
DECADE VI.—VOL. III.—NO. VII. 21 
