BY THE REV. J. E. TENISON-WOODS, F.G.S., F.L.S. 241 



(those of about 90 millimeters long), and the produced posterior 

 wing makes the transverse and longitudinal diameters quite equal. 

 A. barklyi, has been recognized by Prof. Tate, from Cape Creek, 

 and other fossils described by Moore as associated with that fossil 

 from Primrose Springs and Lake Eyre, in Central Australia. (See 

 Trans. Roy. Soc. S. Australia, Yol. vi., p. 144.) They were 

 scattered on the surface much in the way the fossils are at 

 Wollumbilla. 



SUMMARY. 



From the occurrence of some cretaceous forms in this deposit, I 

 am inclined to think that it belongs to the so-called great Creta- 

 ceous formations of Central Australia, and North-eastern Australia. 

 There is certainly also a mixture of Jurassic types, but their evidence 

 is not so marked, and I am inclined to think that there has been 

 a mixture of fossils from different localities in Mr. Moore's collec- 

 tion. There are true Oolitic beds near the Peak Downs, and 

 amongst these I have recognized some of Moore's species, but never 

 the Aviculse, and Belemnite here referred to. It is possible, how- 

 ever, that our Australian Cretaceous rocks may be very low in the 

 series, and contain moreover as in the Australian strata a fusion of 

 those well-marked specific boundaries which paleontologists are 

 accustomed to elsewhere. In any case I am rather disposed to 

 regard the Central Australian beds about Lake Eyre, the Peake 

 and Primrose Springs as cretaceous. I propese to examine the 

 Wollumbilla beds, carefully at my earliest leisure and then will 

 try for its position more certainly. 



Explanation of Plates, 

 Plate XII. 

 Eig. 1. — Trigonia mesembria, inner surface of valve. 

 „ 2. — Upper surface showing concentric costa. 

 ,, 3. — Anterior end with tooth. 

 „ 4. — Avicula barklyi, upper valve. 

 „ 5. — Ditto ditto, lower valve of same specimen. 

 ,, 6. — Another upper valve with better defined ribs. 

 All figures reduced one-half nat. size. 



