574 



Observations on the Dihivial Gravel 



Fig. 71. A reticulated trunk, bearing a number of tliin 

 leaves, by which it has been surrounded. Ironstone nodule. 



Fig, 72. A seed-vessel of a white sparry appearance, em- 

 bedded in dark-coloured ironstone, in company with several 

 leaves. 



Fig, 73. An ironstone nodule, the fracture of which pre- 

 sents three stems of the calamite species, proceeding from a 

 centre, which appears to have been its root.* Calamites 

 VseudiO-Bamhiisia, The drawing is about half the size of the 

 original. 



* Mr. Artis considers the pointed end of this plant to have been the 

 upper termination ; but from the specimen before me it appears to have been 

 its base or root. 



