4 Mr. R. Etheridge on Graptolites from 



the linear central axis is often crenulate from the bases or 

 impressions of cellules of the other division, which is rectan- 

 gular to that part of the frond preserved. {Hall.) 



Numerous specimens of this handsome Graptolite are in my 

 possession from the under-mentioned locality. These show 

 elongato-ovate to obovate form ; but in none is the radicle well 

 preserved, and the crenulate axis or midrib only faintly so — 

 except in one specimen, where the latter is sufficiently ex- 

 posed to demonstrate the specific affinities of the specimens. 

 Hall mentions that the cellules are obscure at the margins ; 

 but in the Australian specimens before me these are mode- 

 rately well marked and almost denticulate. The largest spe- 

 cimen measures 1 inch in length by about 3^ lines in width. 



P. typus is a typical Quebec and Skiddaw species. 



Locality. Newham, near Lancefield, county of Bourke, in 

 blue shale ; collected by Mr. N. Taylor. 



Genus Loganograptus, Hall. 



Loganograptus Logani, Hall. PI. III. figs. 11 & 12. 



Graptolithus Loqani, Hall, Grapt. Quebec Group, p. 100, t. 9. figs. 1-9, 



and t. 11. fig. 7 ; M'Coy, Exhibition Essay, 1861, p. 161. 

 Dichoqraptus Logani, Nicholson, Quart. Joum. Geol. Soc. 1868, xxiv. 



p. 128. 

 Loganograptus Logani, Hall, Twentieth Annual Report, State Cab. New 



York, 1867, p. 226 ; Nicholson, Monograph Brit. Grapt. 1872, pt. i. 



p. 110. 



The imperfect specimens represented by figs. 11 & 12 are 

 the only ones in my possession, although far finer have been 

 obtained from various localities in the colony, and are, I be- 

 lieve, in the geological collection of the National Museum, 

 Melbourne. Only a little more than half the specimen (fig. 11) 

 is preserved. There is no evidence of a disk ; and the state of 

 preservation is not sufficiently good to show the true charac- 

 ters of the cellules. Fig. 12 is also an imperfect specimen, 

 and, so far as I can judge, is an individual of the present 

 species, although there are only eleven stipes preserved. No 

 disk is apparent; but for some little distance around the 

 funicle the matrix is discoloured, or rather has assumed a 

 lighter colour, approaching that of those parts of the organism 

 preserved. 



L. Logani is recorded from both the Quebec and Skiddaw 



series. 



Localities. Newham, near Lancefield, county of Bourke, in 

 blue shale ; collected by Mr. N. Taylor. Mainroad Gully, 

 Mia-Mia, Spring Plains, Redesdale, county of Dalhousie, in 

 red sandy shale ; collected by Mr. N. Taylor and the writer. 



