570 RADIOLARIA IN PALAEOZOIC ROCKS. 



(\-ii.) The red jaspers of Barraba and Bingera may possiljly be 

 of deep sea origin, and represent consolidated " red clays," but 

 this is not as yet pro\ed. 



My thanks are specially due to Dr. G. J. Hinde for the very 

 valuable collection of radiolarian rocks which he has given me for 

 comparison. I am also much indebted to Mr. J. J. H. Teall and 

 to Mr. Howard Fox, as well as to Mr. Voss Wiburd, of Jenolan 

 Caves, and to Mr. Donald A. Porter, of Tamworth. 



I would also b®g to acknowledge the kind assistance gi\'en me 

 throu'-hout the year in the preparation of thin slides of the radio- 

 larian rocks by the following students :— Alice Cooley, Isabella E. 

 Langley, Marion C. Horton and Bertha V. Symonds. I have 

 also to thank Mr. E. F. Pittman, Assoc. R.S.M., for notes and 

 specimens, Mr. W. F. Smeeth for his microphotographs of the 

 radiolarian rock. Professor Haswell and Mr. J. P. Hill for the use 

 of their apparatus and laboratory, and Mr. W. S. Dun, Assistant 

 Palaeontologist to the Geological Survey of K.S. Wales, for kindly 

 (supplying me with references to the bibliography of the radiolaria. 



EXPLANATION OF PLATES. 



Plate xxxvii. 



Surface of calcareous radiolarian rock, etched with dilute KVA., showiii;.' 

 how largely the rock is made up of radiolarian shells, many of which 

 exhibit latticed structure and radial spines x 50. 



Plate xxxviii. 



Fie. 1. — X 200. Radiolarian shell of sub-translucent silica. Form some- 

 what resembling Heliosoma (?). Tamworth. 



Ficr. 2. — X 200. Radiolarian shell of sub-translucent silica. Resembling 

 Ualiomma. 



Fig. 3. — X 200. ,, ,, „ ,, Genus not 



determined. 



Fig. 4. — Radiolarian shell of sub-translucent silica. Genus not determined. 



Fig. 5. ,, ,, ,, ,, Possibly Thi'odisru--^: 



Fig. G.— '„ 



Fig. 7.- 



Fig. 8.- 



Fig. 9.- 



Astromma (?). 



Fig. 10. — Radiolarian shell of sub-translucent silica, showing how the 

 medullary shell outlasts the outer shell. Tamworth. 



Genus not determined. 

 Probably X?'^j/io.s^>A(trre. 

 Genus not determined. 

 Staurolonche (?) or 



