[Quart Journ. Geol. Soc. vol. xvi., to face page 302.] 



n, Tuscany, Noetiierx Sicily, Malta, the Vienna Basln, 



Rather common. 



R. Rare. VR. Very rare. 



19 20 21 22 23 24 25 26 27 28 







IC 

 IC 

 IC 



mC 



fit 



in R 





# 



* 

 * 



* 



* 





102. 

 103. 

 104. 

 105. 







mC 



m C 





sRC 



* 



* 



* 





106. 

 107. 









