THE CARBONIFEKOUS-LIMESTONE SERIES AT CLIFTON. 199 



-with the Corals. Where Litliostrotion and other corals abound 

 tlie Foraminifera occur in every oolitic grain in the dctrital con- 

 dition of the coral-reef. The Foraminifera were diiferent in different 

 oolitic beds. The Ostracoda occur mainly in the Lower- Limestone 

 shales. The unknown body with the spines he suspected to be 

 Radiolarian. He demurred to the position assigned to the Black 

 Rock. He suggested that Mr. Wethcred should take up the subject 

 of the distribution of Foraminifera along with the Corals. 



Mr. WiNWOOD spoke of the specially encrinital nature of the 

 Black Eock, but he thought that the Mollusca also should be taken 

 into consideration. He had recently had sections made of the 

 oolitic limestone from another locality without discovering any 

 nuclei other than quartz. 



Mr. ToPLEY reminded the Author that in his abstract he had 

 omitted mention of the zircons and tourmalines found in the residues, 

 and referred to the researches of Mr. Dick in this connexion. He 

 had used a wise discretion in not making use of the term " Yore- 

 dale Beds." Although the Black Eock might be the " Encrinite 

 Bed " of that particular district, such accumulations did not consti- 

 tute a palaeontological horizon. The typical " Encrinite Bed " of 

 the north is higher in the scale. 



The President observed that, with respect to zircons, all sedi- 

 mentary rocks have been shown to yield them in considerable 

 quantity. 



The Author, in reply, thanked the President and Fellows who 

 had discussed his paper, and especially Prof. Bonney, at whose 

 suggestion he had commenced the investigation, and who had aided 

 him with advice in carrying it on. Mr. Etheridge had misunderstood 

 the position assigned by him to the Black Eock ; their views were 

 identical. He had queried the amorjplious silica in the quartz-crystals 

 mentioned by Dr. Hiude. To Mr. Winwood he replied that in the 

 oolitic beds the quartz-grains are well worn. The zircons and 

 tourmalines found throughout are generally angular. He hoped 

 to deal with the calcareous organisms in another paper. 



