58 DR. G. J. HINDE ON THE EADTOLARIA IN THE [Feb. 1 899, 



The following list shows the genera, and the numbers of species 

 in each genus, of radiolaria, which have been recognized in the 

 Devonian rocks at Tamworth (New South Wales) : — 



Order Beloidea. Species. Order Prunoidea 



Spharozoum 1? Ellipsidium 1 



Ellipsostigma 1 



Order Spk^roidea. Staurodruppa 3 



h(Bra 2 Sjpongocoelia 2 



Liosphcera 



Bhodosphcsra . . 

 Spongoplegma 

 Boryspkcera . 

 XiphosphcBra 



Order Discoidea. 



Theodiscus 1 



Trochodlscus 1 



TriactiRcus 1 



Stylosp)h(sra 2 Distriactis 1 



Staurospkcsra 2 Heliosestrum 1 



Staurolonche 4 Spongodiscus 4 



Staurolonchidium 1 Spongolonche 1 



Trilonche 3 Spongotripus 2 



AcanthosphcBra 2 



Heliosphcera 4 Order Plectoidea. 



Heliosoma 2 Plagiacantha 1 



Plagoniscus 5 



No. of No. of 



Order. Genera. Species. 



Beloidea 1 1 



Sphasroidea 14 27 



Prunoidea 4 7 



Discoidea 8 12 



Plectoidea 2 6 



29 63 



ly. General Characters an^d Affinities of the Eadiolaria. 



From the preceding list it is seen that 53 species belonging to 

 29 genera of radiolaria have been determined from the Devonian 

 rocks of Tamworth. Four genera and all the species are considered 

 as new. The apparent absence of known species in these deposits 

 will appear less remarkable when we remember that our present 

 knowledge of Palaeozoic radiolaria is limited to those occurring in 

 a few outcrops in Central and Northern Europe, and that those 

 herein described are the first known from older rocks in the Southern 

 Hemisphere. Considering the great thickness of the Tamworth 

 radiolarian deposits, and the immense number of the organisms in 

 them, one might have anticipated that a greater variety of forms 

 would be found. It is probable indeed that the 53 species figured 

 do not represent a moiety of those present in the rocks, for com- 

 paratively few fragments of the beds have as yet been microscopically 

 examined, and many of the organisms in these have had to be passed 

 over as too fragmentary for description. 



The distinguishing feature of the Tamworth radiolaria is the 

 very large proportion of forms with central or medullary latticed 

 tests and radial spines. A glance at the figures in the accompanying 



