349 



llotcs on (Scological ^jjccimcus j^rcscutcb to t|e 

 lliiseiim h) M. Cunniudtou, ^£3- 



A KICMAKKA1!LE FLINT KKOM GkOVELEY WoOD. 



Originally an ordinaiy Hint derived from the chalk, this specimen 

 has been subjected to such severe crushing action that the greater 

 part of it was reduced to minute chips. It has since lieeii cemented 

 into a solid mass by tlie infiltration of chalcedonic silex ; the larger 

 fragments on the outside adhering, but standing out rouglily from 

 the surface. There is at present no explanation of the mechanical 

 and chemical processes which have acted on this curious flint. 



The other half of it was presented to the Museum liy the finder, 

 the late Mr. H. Cunnington. 



Ax Uls'DESCIUBKD COKALLOID FROM CaLNE. 



In 1867 I found a very remarkable form of coralloid in the large 

 quarry of the Pisolitic Coral Eag, at Calne. It was a lump of 

 rough-looking stone, with slight concentric lines which attracted 

 attention, and a blow with the hammer revealed a structure marked 

 by flue bands of a delicate pink colour. These bands represent 

 various stages of growth of the animals by which the mass was 

 l)uilt up. Examined in the microscope it will be seen to consist 

 entirely of extremely minute straight tubes, more minute than 

 have been previously observed in this class of animals. The tubes 

 are about the fifteenth of a millemeter in diameter. They are 

 occasionally crossed by delicate tables, and are perforated at 

 irregular distances by minute pores. The exact characters of this 

 fossil have not yet been determined, and it is as yet without a 

 name. Mr. A. H. Foord, of the British Museum has kindly ex- 

 amined it, and reports that it belongs to a group of fossils of which 

 Cha'tetes pnli^tonis, of Quenstedt, and CJiaictefi crqn/iforviis may be 



