330 Mr. CoNYBEARE on the Origin of a remarkable 



2. That the globules themselves were casts moulded (in the 

 manner already described) in cavities existing in the substance of 

 the shell in question. 



The most important of the appearances from whence these con- 

 clusions seemed to be deducible were the following. 



The flat surface occupied by the globular bodies at one extre- 

 mity of fig. 2. is terminated by the perpendicular face or escarpment, 

 (if I may so employ that term) formed by a portion of the flint 

 elevated a little above the rest; and this escarpment will be found 

 marked with minute vertical stride, seeming to indicate that it had 

 been moulded against the edge of a fragment of the striated shell, 

 already alluded to j similar striae are observable round the edges of 

 another elevated portion towards the centre of the specimen, in some 

 degree resembling the mill-marks round the edge of a coin, and 

 they again occur on both sides of a small vein, or rather dyke of 

 flint traversing a cluster of globules, and cutting many of them 

 through the middle. This striated dyke had therefore all the cha- 

 racters of an impression formed in a long and narrow fissure of the 

 shell in question, and was connected with the globular bodies in 

 such a manner that the formation of the latter could scarcely be as- 

 signed to any other cause than that which produced the former. 



In order to represent these appearances more clearly to the eye, 

 several slight liberties have been taken in the drawing fig. 1. the 

 relative position of some parts of the original specimen has been 

 changed, and to the indications in question, a more prominent cha- 

 racter than they really possess has been given. The small scale of 

 the general outline fig. 1. not exceeding one of the original size, has 

 rendered this more necessary ; but in fig. 2. a detached representa- 

 tion of the siliceous dyke traversing the globular bodies has been 

 added, on a scale rather larger than the original. 



