442 T. 8. Sail — GraptoUie Rocks, Victoria, Australia. 



Main Divisions of the Graptolite Beds. 

 Lower Ordovician. 



1. Lancefield Series. — The blue black shales of this locality yield 

 a fauna which I have dealt with in some detail elsewhere/ 



The species recorded are : Bryograptus Victorice, T. S. Hall ; 

 Jh-yograptiis ClarJci, T. S. Hall ; Leptograptm antiqnus, T. S. Hall ; 

 Didymograptns Pritchardi, T. S. Hall ; Didymogrnptns Taylori, T. S. 

 Hall ; Tetrngraptus decipiens, T. S. Hall ; Clonograptus fl'xilis, 

 J. Hall ; Clonograptus magnificus, Pritchard ; Clonograptus rigidus, 

 J. Hall ; Clonograptus rigidus, var, tenellus, Linnars ; Pliyllograptus ? 

 sp. ; Dicti/onema Macgillivrayi, T, S. Hall ; Dictyoriema pulchellum, 

 T. S. Hall. 



There is at first sight a strange intermingling of genera here^ but 

 the species are all associated in one small excavation, and no separa- 

 tion of the beds is possible. From the occurrence of Bryograptus, 

 which is fairly common, the beds must be regarded as the oldest of 

 our graptolite-bearing rocks yet found, while from the presence of 

 the other associated genera they cannot, I think, be regarded as 

 Cambrian, but must be looked on as Ordovician. 



2. Botdigo Series. — As far as is known, the greatest development 

 of these beds is in the Bendigo district, where our richest auriferous 

 quartz veins occur. A similar fauna is also found at Chewton, 

 Daylesford, Tarilta, Newstead, Spring Plains, Upper Loddon, and 

 near Lancefield. 



Minor subdivisions in this thick series will doubtless be made, but 

 at present no salient differences have been noted between the faunas 

 of the various exposures. The fauna is rich, and at Bendigo is 

 usually fairly well preserved, though the beds are often indurated 

 and much cleaved. Many new species are as yet undiagnosed, and 

 several of the old records of Didymogrnptns (sensu stricto) are 

 probably incorrect. I have not seen any Diplograptidse from the 

 rocks of this series, though two species have been recorded from 

 Bendigo. As the family is represented in younger rocks a few miles 

 to the north of the town, in what is known as the Whip>stick Country, 

 it is probable that they came from there, the term Bendigo having 

 been used in a loose geographical way. In any case the specific 

 record is open to doubt. 



The following species occur, amongst others: Didi/mograptus 

 hifidus, J. Hall ; D. gracilis, Tqt. ; D. cf. decens, Tqt. ; D. caducens, 

 Salter; Tetragraptus fntticosus, 5.^dl\ \ T. serra, Brong. ; T. quadri- 

 hrachiatus, J. Hall ; Dichograptus octohrachintus, J. Hall ; Pliyllo- 

 graptus typus, J. Hall; Goniograptus Thureaui, McCoy; G. macer, 

 n.sp. (vide infra). 



A mere inspection of the list hardly brings out the character of 

 the fauna, as a good deal depends on the I'elative abundance of 

 Certain forms. 2'etrayraptus fruticosus and Pliyllograptus typus are 

 very abundant, while Didymograptus bijidus is very rare and 



' Proc. Roy. Soc. Victoria, new ser., vol. xi, 1898 (1893), pp. 164-178, pis. xvii, 

 xviii, xix. 



