The Graj^toUtes of Lancefield Beds. 177 



of north. At Lancefield the rocks strike N. 15° W. and are 

 cut off to the north by another granite area, that of the Baynton 

 Range, while beyond this again palaeozoic rocks with the same 

 strike occur. Now, if the line of strike of the Lancetield rocks 

 be followed across the granite to Heathcote, a distance of thirty 

 miles, we come to a locality yielding fossils considered by Mr. 

 R. Etheridge, jr., as probably of Middle Cambrian age.^ 



It is true that no great weight can be attached to this fact 

 in the way of supporting the Cambrian age of the Lancefield 

 beds, though it points to the strong probability of the so called 

 rnetamorphic rocks to the eastward of the graptolite beds at 

 Lancefield being true Cambrian. 



Taking all the facts into consideration I think that less 

 violation will be done to generally accepted ideas by regarding 

 Bryograptus as here ranging up into the Ordovician than by 

 looking on the other genera as dating back to Cambrian times, 

 and we are, I venture to think, justified in considering the 

 graptolite bearing beds of Lancefield, which are dealt with in 

 the px'esent paper, as Ordovician rather than Cambrian. 



EXPLANATION OF PLATES XVII., XVIIL, and XIX. 



Fig. 1. — Bryograptus victoriae, n. sp., nat. size. 

 ,, 2. ,, ,, same specimen x 3^. 



,, 3. — Bryograptus clarki, n. sp., nat. size. 



„ 4. „ ,, same specimen x 5. 



,, 5. — Leptograptus antiquus, n. sp., nat. size. 



„ 6. ,, ,, same specimen x 5 (Coll. 



G. Sweet). 

 „ 7. — Didymograptus pritchardi, n. sp., nat. size. 



„ 8. ,, „ nat. size ; showing 



3 branches. 

 „ 9. — Didymograptus pritchardi, proximal part of No. 8x5. 



,,10. ,, ,, proximal part of another 



specimen showing virgula. 

 „ 11. — Didymograptus taylori, n. sp., nat. size. 

 „ 12. ,, „ proximal part X 3. 



1 Proc. Roy. Soc. Vic, N.S., viii., 1896, p. 52. 



