326 International Geological Commission. 



and Sfylina, a species is referred to Calamophyllia StoTcesi, already 

 known from the Coral Eag, and one, with doubt, to C. radiata of the 

 Great Oolite, and two species, described originally uniler the genera 

 AgtroccBnia and HoloccPAiia respectively, are referred to Stylina. The 

 remaining eight species are new to science, and consist of Cala- 

 mophyllia Mentonensis, most nearly related to two Coral Eag species, 

 Thecosmilia spadce, with allies in the Coral Eag and Inferior Oolite, 

 Cladophyllia Mentonensis, Pacliygyra costata, and Stylina nicoensis, an 

 octomeral species, which is intermediate between S. pistillum and 

 S. octonaria. A new genus is found in the family AstrEenite, named 

 Diplocceniastrcea, for a new species called D. Italica, it differs from 

 Diploccenia by the toothed character of the septa and the spongy 

 texture of the columella. Among the Cladocorall^ a new species is 

 described as Pleurocora ? Boccahrunce, a new Tabulate is named 

 Cryptoccenia incerta. The rock evidently belongs to the Coralline 

 Oolite, and is consequently more recent than that of Monte Pastello. 

 From the sandstone of Monte Cavallo, of the Friuli district, twenty 

 species were obtained, of these fifteen were Madreporaria aporosa, 

 four were Tabulata, the remaining one was the Upper Coralline 

 Oolite species Mtcroselena tuberosa. Eight out of the fifteen species 

 were hitherto undescribed, and are named CalamopTiyllia suhstohesi, 

 Septastrcea colturensis, Phyllastroea forojulensis, and F. duhia, Stylina 

 irradians, S. stipata, S. arhorea, Isastraia Italica. The Tabulates 

 were all new and are named Cryptoccsnia subbrevis, C. colturensis, 

 C. ? incerta, CyatJiopliora Pirovce. The affinities of the species are 

 chiefly with those of the Coralline Oolite, In the calcareous rock 

 immediately underlying the sandstone were found ten species, 

 including the above new species Pliyllastrcea forojtdensis, the new 

 species Stylina digitiformis, and two species possibly identical with two 

 forms described from the before-named bed, — in all nine Aporosa, 

 and one species of Porosa. The Coral fauna of this group of rocks, 

 as well as their Mollusca, have already been determined to be Upper 

 Coralline Oolite. 



Note. — It should be observed that the names of a few of the new 

 species were given by Prof. Meneghini, but as he appears not to 

 have published any description of them, the author's name in their 

 case also should stand as " D'Achiardi." 



International Geological Commission. 



AT meetings held by the Committee of Organization for Great 

 Britain and Ireland (Prof. T. McK. Hughes, M.A., President), 

 the following definitions have been agreed upon. 



System. — The word System shall be applied to a group which 

 stands by itself, easily and clearly distinguishable from the rocks 

 above and the rocks below, and is generally bounded above and 

 below by a well-marked break in stratigraphical sequence, and is 

 characterized by special forms of life. 



