28 PROP. T. W. E. DAVID & MR. E. F. PI'ITMAN [Feb. 1 899, 



(PL VI), showing disturbed masses of radiolarian shale enclosed and 

 entangled in a thick bed of submarine tuff. 



With regard to the geological age of the Eadiolarian Series at 

 Tamworth, as evidenced by fossils other than radiolaria, some i a 

 may be formed from the following list, which has been prepared for 

 us by the courtesy of Mr. E. Etheridge, jun. — the fossils all occurring 

 in the thick coral-limestone. Mr. Etheridge considers that these 

 corals represent the Middle Devonian age of the limestone, which 

 corresponds with that of the Eurdekin Beds of Queensland.^ 



List of Corals in the thick Limestone of the 

 Tamworth District 



(determined by Mr. R. Etheridge, jun.). 



1. Amphipora ramosa, Phill. 



Highly sihcified, but not to be distinguished macroscopically from British 

 specimens. 



a. 



Moor Creek. 



2. I)iphy;phyllum Porteri, Eth. fil. 



An interesting form differing essentially from the known Carboniferous 

 species. 



a. ' Tamworth ' (D. A. Porter). 



3. Bi'phyiiihyllum, sp. noT.-J 



A large robust species, allied to D. arundinaceum, Billings, from the 

 North American Cornifecous Limestone, 

 a. Moor Creek. 



4. Gen. et sp. nov. 



A very peculiar Zaphrentoid coral, in which all the corallites are united 

 and surrounded at one and the same level, and in successive tiers, by a 

 delicate, plate-like, thecal expansion. 

 a. One mile north of Tamworth. 



5. Spongophyllum, sp. nov. 



A much larger species than the allied 8p. hipartitum, Eth. fil., from the 

 Yass district, and with nearly 2^ times as many septa. 

 a. Moor Creek. 



6. Microplasma, sp, nov. 



A fasciculate and well-marked species of a genus, chiefly Silurian, but 

 also found in the Devonian of Grermany. 

 a. Moor Creek. 



^ Jack & Etheridge, jun., ' Greol. & Palaeont. of Queensland & New Guinea ' 

 (1892) p. 47. 



^ [It is expected that detailed descriptions of this and the other new forms 

 in this list will be published by Mr. Etheridge in Eec. Geol. Surv. N.S.W.] 



