ORDER III RADIOLARIA 45 



Cittiglio, near Laveno on Lago Maggiore, and numerous Tithonian jaspars, as 

 well as the Alpine Aptyclius beds, are charged with Radiolarians ; here the 

 Nasselaria are nearly as plentiful as the Sjnimellaria. The Lower Cretaceous 

 (Neocomian) of Gardenazza has yielded but few forms. On the other hand, 

 coprolites from the Gault, found near Zilli in Saxony, and Lower Cretaceous 

 clay marls in Manitoba, Canada, as well as from Upper Cretaceous marls of 

 Haldem in Westphalia, and Vordorf in Brunswick, contain excellently preserved 

 skeletons in greater or less abundance. Even the flinty concretions of the 

 Upper Chalk sometimes contain them, although in a poor state of preservation. 

 Certain Eocene hornstones in Italy, according to Pantanelli, are filled with 

 Radiolarian remains, while in the Flysch they are also very profuse in some 

 localities, although usually poorly preserved. 



By far the most noted occurrence of fossil Radiolarians is in the siliceous 

 " Barbados earth," of Miocene age, in which Foraminifera are also very con- 

 spicuous ; while the " tripoli " of Grotte, Caltanisetta and Girgenti in Sicily, 

 of Oran, Aegina, Zante, the Nikobar Islands and other localities (Miocene and 

 Pliocene), is scarcely less noteworthy. Ehrenberg has described 278 species 

 from Barbados alone, and from Sicily Stohr has described 118 species, most of 

 which belong to still extant Spumellarian, Nasselarian and Phaeodarian genera. 



