GRAfTOLITES IN TASMANIA. 17 



As the thecae can be seen only when the specimen is held 

 in a particular position with regard to the light, they are 

 not easily demonstrated. Their outer edge is straight, and 

 the apertural margin is about normal to the branch. From 

 the appearance of the indistinct markings present on the 

 stone the specimen belongs to the Dendroidea, and I am 

 inclined to think to the genus Callograptus, which is in itself 

 of no great stratigraphical value. 



A few weeks ago Mr. Waller sent me two slabs of slate 

 from 12| miles from Zeehan, on the same railway line. On 

 one of these a fragment showing graptolite thecae can be 

 distinguished, the specimen being monoprionidian. The 

 specimen on the other slab is more obscure, and I can only 

 say it is suggestive of a graptolite. In neither instance can 

 even a guess at the family be hazarded. 



We thus have undoubted evidence of the existence of 

 graptolites in Tasmania, but, so far, no evidence is thrown 

 on the exact age of the containing rocks, and it rests with 

 those on the spot to fill up the hiatus in our knowledge. 



Mr. Stephens' specimen has been sent to the Hobart 

 Museum, and Mr. Waller's two specimens to Mr. Twelvetrees, 

 for the Survey Collection. 



