REPORT OF THE STATE PALEONTOLOGIST 1901 5G9 



slates. In the latter (Ellergill beds) it is, however, reported 

 to be associated with forms which are characteristic of the 

 next higher Deep kill zone, while the species, associated here 

 with D. bifidus, specially Phyllograptus tjpus 

 and P . anna, are according to Miss Elles found there in 

 the middle Skiddaw slates. In regard to this association it is 

 stated {loc. cit. p. 529) : "Tetragraptus serra (Brong.) 

 and other forms are also found associated with the fauna which 

 in Sweden characterizes the zone of Phyllograptus cf. 

 t y p u s and occur on the same slab as the earliest tuning fork 

 Didymograpti.'' This association forms the upper Tetragraptus 

 siil)zone (corresponding to the upper Arenig) loith which ice have 

 to correlate the present Deep hill zone or the St Anne beds of Canada. 



In Scania the zone with Phyllograptus cf. typus and 

 Didymograptus cf. bifidus forms, according to Tull- 

 berg, the highest part of the lower Graptolite shale and over- 

 lies the Orthoceras limestone (limestone with Megalaspis 

 planilimbata and Megalaspis limbata). But, 

 as this zone is also reported to contain Climacograptus and 

 Cryptograptus, which here do not appear till the next zone, 

 this Scanian and the Deep kill zone can not be exactly 

 parallelized; and it is to be assumed that the former holds 

 a position intermediate between this and the next Deep kill 

 zone, and that the St Anne heds are homotaxial icith the Megalaspis 

 limestone itself. 



In Bohemia a form from etage T> Uly has been identified with 

 Didymograptus bifidus by Dr Pernor ;^ and in France, 

 as noted before, Didymograptus bifidus and K o u - 

 villigraptus richardsoni, two species of the St Anne 

 beds, have been reported from the graptolite shales of Cabri^res. 

 Finally, the zone with Didymograptus bifidus was 

 recognized by T. S. HalP as a separate horizon in the aurif- 

 erous shales of Victoria in Australia, where it also overlies 

 the Tetragraptus zone. It appears that in Australia and New 



^ Etudes sur les Graptolites de Bobeme. 2ieme partie. 1895. p. 23. 

 ^ Austr. ass'n adv. sci. 1893. 5:374. 



