291 
I believe the identifications are correct as the specimens are in a fairh 
good state of preservation. The rock containing the two species appears 
to be the same in each case, and is a bluish slightly cleaved slate, in which 
the fossils are sometimes pyritic. As Mr. Ferguson is sure that no con¬ 
fusion of localities has occurred, I am uncertain as to the exact horizon, 
and further careful collecting is advisable. 
Horizon, Castlemainian. Exact horizon doubtful. 
Nos. 6317-6344. 
Field number 27 S.Z. From the North Mariners shaft. From the 
north-west corner of the Steiglitz cemetery, parish of Durdidwarrah, bear¬ 
ing 225 0 for 85 chains. 
Didymograft us bifidus (common). 
Didymo graptus caduceus (scarce). 
Tetragraptus serra (? 1 example). 
Pkyllograptus cf. typus (common). 
Horizon, Castlemainian, lowest zone. 
Nos. 6345-6353. 
Field number 28 S. ; Z. From the north-west corner of allotment 44, 
section A, parish of Durdidwarrah, bearing 350° for 10 chains. 
Diplograptus sp. (several). 
Horizon uncertain, but possibly Upper Castlemainian. 
Nos. 6354-6361. 
Field number 29 S.Z. From the north-east corner of Recreation 
Reserve, parish of Durdidwarrah, bearing 232 0 for 20 chains. 
?Diplograptus sp. (1 example). 
PL asio graptus sp. (1 example). 
The rock is a nodular slate, and the specimens are very indistinct. 
Horizon, very doubtfully Darriwilian. 
Nos. 6362-6392. 
Field number 31 S.Z. From the north-east corner of the Recreation 
Reserve, parish of Durdidwarrah, bearing 22o° for 17 chains. 
Didymograptus extensus (1 example). 
. Didymo graptus spp. (3 examples).' 
Didymo graptus caduceus (2 examples). 
Tetragraptus serra (2 examples). 
Tetragraptus bryonoides (5 examples). 
Pkyllograptus cf. typus (common). 
Horizon, Lower Castlemainian. 
Nos. 6393-6402. 
Field number 35 S.Z. From the north-west corner of Allotment 
No. 9, Steiglitz township, parish of Durdidwarrah, bearing 76° for 
6 chains. 
Didymo graptus caduceus. 
Pkyllograptus typus. 
Horizon, Lower Castlemainian. 
