271 
Nos. 497, 498, 507 (?), 517, and 518 have thecae of the “ priodon ” type. 
The other specimens are only generically determinable, and I can detect no 
trace of any other graptolite genus among the hundreds of examples present 
on the slabs. 
Specimen 506, in addition to Monograptus , shows a fragment of an 
Orthoceras , and No. 508, also in addition to Monograptus, displays an 
indeterminate organism. The age is Silurian and evidently close to that of 
the Alexandra graptolite beds. 
From spur south-west of Blaze Xlll. at Thomson River , 5J miles from the 
Jordan junction. 
(Nos. 522-538, 547 and 548. Collected by Mr. Wm. Baragwanath, jun.) 
Nos. 522-538 are specimens of Monograptus , similar to Nos. 488-521 
and 539-546. None are specifically determinable. The age is Silurian. 
Nos. 547 and 548. The locality given for these two specimens is near 
that of Nos. 522-538, but I find a difficulty about them. No. 547 is a 
Monograptus , and is therefore a Silurian form, whereas No. 548 is a 
Didymograptus, having the aspect of D. caduceus. The cast of the sicula 
can be clearly seen and the reverted apertural dlenticles of the thecae are 
visible. Of the generic position of the fossil there can be no question. 
The matrix, an indurated blue micaceous mudstone, appears the same as 
that of many of the other specimens from the same spur, but I feel con¬ 
vinced that the presence of this Lower Ordovician type in association with 
Mortograptidce is an error due to human agency.* With the exception of 
this fossil the whole of the rest of the fossils (Nos. 522-538 and 547) are 
of Silurian age. 
From Geological Quarter sheet , No. 34, S.W. Wood’s Point. 
' (Collected by Mr. O. A. L. Whitelaw.) 
(Nos. 552-614.) 
Unfortunately they are in no case specifically identifiable. 
From No. 10 spur on the Main Divide, between Spring Hill and Mount 
Selma. 
(Nos. 55 2 - 555 -) 
These are referable to Diplograptus. Age uncertain, but either Lower 
Silurian or Upper Ordovician. 
From No. 12 Blaze , on the Main Divide. 
(Nos. 556-592.) 
No. 559 I can see nothing on, but all the others are apparently referable 
to Diplograptus. Age uncertain, but either Lower Silurian or Upper 
Ordovician. 
From Black River, near junction with Ten Mile Creek. 
(Nos. 593-614.) 
No. 601 is apparently a fragment of a Dicranograptid. The thecae 
are visible, and apparently are twisted laterally, while the dorsal wall is 
thickened. The thecae, as far as can be made out, are not those of 
* In the face of Mr. Baragwanath’s personal assurance that there was no confusion of localities in these 
two specimens, but that both came from the same block of stone, I have requested permission to re-examine 
them. I see no reason to alter my opinion as to their generic position. I have, moreover, explained the 
case to Mr. F. Chapman, A.L.S., and he has examined the supposed Didymograptus. He allows me to say 
that he agrees with my identification. Further specimens are urgently required from this locality as the 
inferences to be drawn are too important to rest on a couple of very indistinct fossils. 
