172 Notices of Memoirs — L. Cayeux — On Fossil Radiolaria. 



island which has since gradually disappeared. East of Pantellaria, 

 in the direction of Malta, tlie little island Limosa is also volcanic, 

 thus widening the extent of this volcanic region. 



Like Ischia, Pantellaria has thernio-mineral springs, used formerly 

 by the Romans and Arabs ; and indeed of the same character as 

 those of Vichy and Ischia ; and, if the surroundings were rendered 

 more favourable by the removal of the convict-station to some other 

 Italian island, and if some little capital were then judiciously laid 

 out, these medicinal waters might have much therapeutic and 

 economic importance as a convenient Mediterranean resort. In the 

 eastern part of the island are the Candareddu de lu Bagnu ; also the 

 Bagnu or hot lake in an old crater; and the Acqua della Grotta di 

 Gadir. At the S.W. end of the island is the Acqua della Cala Nita, 

 the hottest of all ; not far off the Acqua del Porto di Saura Basso ; 

 and northwards, about five miles from town, is the Acqua salina di 

 Sataria. Thei-e are also fumaroli, or emanations of aqueous vapour. 

 One, termed Bagno secco, is in a cave, forming a Stufa or Sudatorium. 



Some sulphur occurs in old fumaroles. The alkaline bicarbonates 

 in the Candareddu de lu Bagnu and the Cala Nita transform the 

 silica of the rock into soluble gelatinous silica, and then deposits it 

 as a dirty-white or grey opal. Obsidian, pozzolana, pumice, and 

 some special minerals also occur in the island. The mineral wealth 

 and springs of Sicily and Pantellaria are described in Mr. Jervis's 

 " Mineral Waters of Southern Italy," and " Subterranean Treasures 

 of Italy." 1 T. H. J. 



III. — The Existence of Numerous Badiolaria in the Jurassic 

 AND THE Eocene of the North of France. By L. Cayeux. 

 (Annales de la Societe Geologique du Nord, Vol. XIX. 1891, 

 pp. 300-315.) 



§ I. M. Cayeux has found Badiolaria (1) In some Eocene tuffeaus 

 (tufaceous limestones) ; (2) In the Oxfordian " gaize " (clay) 

 with Ammonites Lamherti. They will be described in detail bj^-and- 

 bye. 1. The rocks improperly termed " tuflfeaux " consist of organic 

 debris with a siliceous cement. The organisms are Sponge spicules, 

 a few Diatomacese, and a large number of various spheroidal skeletons 

 of Radiolaria, belonging to Hiickel's Monospharidce and Displicerida. 

 A. The Landenian Tufteau at Bouchevesnes has about a sixth of its 

 bulk made up of Radiolaria ; at Malincourt Tournay, Lille, Angre, 

 and Radinghera they are rare. B. The Ypresian Tufifeau of Mont- 

 des-Cats. 



These discoveries in the Lower Eocene are important in as much 

 as the Radiolaria described by Shrubsole from the London Clay are 

 the only other Eocene forms known, if those described from the 

 jasper of Tuscany be really Jurassic as regarded by Eiist and Hiickel. 



2. Radiolaria have been found in the Oxfordian Clay at Launois, 

 Lalobbe, and La Neuville (Ardennes). Microscopic sections of small 

 hard morsels of this " gaize " show a somewhat similar structure to 

 1 Geological Mag. 1889, pp. 176-177. 



