the Lower Silurian Rocks of Victoria. 3 



noidesy more in deference to the opinion of others better versed 

 in this difficult group than myself; but nevertheless the exa- 

 mination of many Australian specimens has shown the posi- 

 tion of the two stipes and " apparent radicle " to be so con- 

 stant, that I am led to the conclusion that we should pause 

 before finally considering the two species synonymous. At 

 any rate, if they are one and the same, I think Salter's name 

 might with advantage be retained as a varietal designation for 

 such forms as those represented by figs. 3 & 4. 



T. hryonoides is characteristic of the Quebec group in Ame- 

 rica and the Skiddaw group of the north of England. 



Localities. Watchbox Ranges, near Baynton's, county of 

 Dalhousie, in blue shale ; collected by Mr. N. Taylor. Castle- 

 maine, county of Talbot, in chocolate shale ; collected by Mr. 

 G. H. F. Ulrich. Mainroad Gully, Mia-Mia, Spring Plains, 

 E-edesdale, county of Dalhousie, in red and white sandy shale ; 

 collected by Mr. N. Taylor and the ^vriter. 



TetragrajJtus quadrihrachiatus^ Hall. PI. III. figs. 5-8. 



GraptoUthus quadribrachiatus, Hall, Grapt. Quebec Gr. p. 91, t. 6. 



figs. 1-5, t. 6. figs. 5, 6. 

 Tetragraptus crucialis, Salter, Quart. Joui-n. Geol. Soc. 1863, xix. p. 137, 



fig. 8 6. _ ^_ 

 quadribrachiatus, Nicholson, Quart. Joum. Geol. Soc. 1868, xxiv. 



p. 131 ; M'Coy, Exliibition Essay, 1861, p. 161. 



Frond composed of four simple undivided stipes arranged 

 bilaterally, or two proceeding from each extremity of the 

 funicle &c. [Hall.) 



The specimens represented by figs. 5, 6, 7, & 8 I have re- 

 ferred to this species. The stipes appear to be somewhat 

 wider than in those figured by Hall (but this may perhaps be 

 due to pressure), and the funicle slighter. 



This species is characteristic of the Quebec and the Skiddaw 

 series. 



Localities. Watchbox Ranges, near Baynton's, county of 

 Dalhousie, in blue shale ; Newham, near Lancefield, county 

 of Bourke. Collected by Mr. N. Taylor. 



Genus Phyllograptus, Hall. 

 Phyllograptus typus^ Hall. PI. III. figs. 9, 10. 



Phyllograptus ti/pus, Hall, Grapt. Quebec Group, p. 119, pi. 15, figs. 1- 

 12; M'Cov, Exliibition Essay, 1861, p. 161 ; Nicholson, Quart. Journ. 

 Geol. Soc' 1868, xxiv, p, 133, pi. 5, fig. 16, 



Stipes robust, composed of four semielliptical parts joined 

 by their straight sides. In some specimens of this species 



1* 



