38 DE. G. J. HIKDE OlSr THE EADIOLAEIA IN THE [Feb. 1 899, 



4. On the Eadiolaeia. in the Devonian Rocks of New South Wales. 

 By Geoege Jennings Hinde, Ph.D., F.R.S., F.G.S. (Read 



November 9th, 1898.) 



[Plates VIII & IX.] 



Contents. 



Page 

 I. Introduction 38 



II. Character of the Eocks and Mode of Preservation of the Radiolaria. 38 

 (a) The Chert-rocks with Radiolaria. 

 {h) The Siliceous Limestones with Kadiolaria. 

 (c) The Siliceous Claystones and Shales with Eadiolaria. 

 {d) The Volcanic Tuffs with Radiolaria. 



III. Description of the Eadiolaria 42 



IV. General Characters and Affinities of the Eadiolaria 58 



V. Fossils associated with the Eadiolaria 60 



VI. Summary 61 



I. Inteoduction. 



On the invitation of the authors of the foregoing paper, I very 

 willingly consented to undertake an examination and description of 

 the radiolaria occurring in the extensive series of Devonian rocks 

 in New South Wales which they have recently brought to light, and 

 accordingly they forwarded to me, in the spring of 1897, a box of 

 hand-specimens of typical examples of the different kinds of radio- 

 larian rocks, and these have been supplemented since by a few 

 other specimens received during the present year. Microscopic 

 sections have been prepared from them ; and from such as contained 

 the radiolaria in good preservation (as, for example, the dark 

 siliceous limestones and some of the volcanic tuffs from Tamworth), 

 numerous slides were made, so as to obtain as large a variety of the 

 organisms as possible. 



The rocks sent me were derived from the following four locali- 

 ties : — (1) Bingara and (2) Barraba : red jaspery cherts ; (3) Jenolan 

 Caves and vicinity : black chert : (4) Tamworth : black chert, dark 

 siliceous limestone, siliceous claystone or shale, and volcanic tuff. 



II. Chaeactee of the Rocks and Mode of Peeservation of 



THE RaDIOLAEIA. 



Before describing the radiolaria, it will be desirable to refer to 

 the character of the rocks of which they form so important a part, 

 and to their mode and condition of preservation. 



[a) The Chert-rocks with Radiolaria. 



The jaspery cherts of Bingara and Barraba are hard and flinty, 

 of a brick-red tint, and fairly translucent in section. They are 

 traversed in all directions by thin microscopic veins and strings of 

 microcrystalline quartz. The rock is cryptocrystalline ; only a few 



