LoweT Silurian.] rAL^ONTOLOGY OF VICTORIA. [Graptolites. 



then able to recognise the true geological age of the gold-bearing 

 slates of the colony for the fii'st time. The same species was 

 subsequently discovered by Professor Hall in Canada; and as he 

 kindly sent me an early proof of his illustration before publication, 

 I of course adopted his name as above. 



The extraordinary symmetrical grace of the regular form in 

 which this most l)eautiful species is developed renders it very easy 

 of recognition, and even fragments are clearly marked by the great 

 size of the broad triangular denticles. 



The Victorian specimens are perfectly identical in all respects 

 with the N. American ones. 



Common in the Lower Silurian slates (Llandeilo flags) of Bird 

 Reef, Bendigo ; in the smooth, red shales of (B*" 46) section 29, 

 Spring Plains ; in Black flags of B" 45; (B" 76) altered slates on 

 bank of Eiver Loddon, half way between junction of Boundary 

 Creek and IMiddleton's Creek ; in flags on E. bank of Saltwater 

 River, 1 mile from Bacchus Marsh road. 



Explanation of Fiqukes. 



Plate I. — Fig. 9, email, perfect specimen, natural size, with the 4 branches in their normal 

 position, but defectire at the upper ends. Fig. 10, portion of larger specimen, defectire above 

 and below, nsitural size. Fig. 11, moderate-sized specimen, one branch broken, natural size. 

 Fig. Ilo, portion magnified, but the angle of the denticles not sufficiently extended outwards 

 or acute. Figs. 12, 13, and 14, smaller specimens, natural size, one of the branches broken 

 from fig. 13. 



Frederick McCoy. 



t U J 



