456 



DOMAIN V. CALCAREOUS. 



be distinguished from those of the encrinite, rarely 

 marked by the lily at the summit. 



Limestone, with nummulites, from Egypt. 



With entrochites, Derbyshire. . 



With madreporites, from Gothland. 



Numerous other examples may be added, from 

 all countries ; exclusive of the mere calcareous 

 petrifactions, which are found slightly adherent 

 or apart. 



STRUCTURE V. PISOLITE. 



This kind is so called from its appearance, 

 resembling conglomerated peas; and is chiefly 

 brought from Carlsbad in Bohemia, where it con- 

 stitutes a large bed. It is of a yellowish white ; 

 and the imaginary peas are in elegant concentric 

 layers of white and brown, formed around a grain 

 of sand, like pearls in the shell. Cronstedt has 

 with some propriety ranked it among the sinters 

 or depositions, 



STRUCTURE VI. SINAFITE. 



In this the orbicular accretions are smaller 

 than in the former; the structure quite distinct, 

 and more compact. The name is derived from 

 mustard seed. Some call it meconite, from the 

 seed of the poppy; while others use the term 



