Mr. C. Collingwood on the Sulphur Springs of Formosa. 401 



containing corals and several species of Brachiopods in good pre- 

 servation ; (5) the " Martinhoe group," unfossiliferous ; (6) the 

 " Lynton Beds" with few fossils ; and (7) the " Foreland grits," 

 which are without fossils, and the lowest of the series. 



9. " On the Geology of the Princess Islands in the Sea of Mar- 

 mora." By W. R. Swan, Esq. 



Mr. Swan pointed out the existence of a considerable mass of 

 Devonian strata, partly fossiliferous, in several of these islands, of 

 an age different from that of the beds of the Bosphorus, which latter 

 he has shown in a former paper to belong to the lowest of the Devo- 

 nian series of the Rhine. The presence of remains of tish in the 

 above strata, and of an ancient coral-reef in one of these islands 

 (Andirovitho), was also noticed. 



The rocks which form the remaining portions of these islands are 

 (1) Trachytic, of younger age than the Devonian strata, and (2) 

 Trappean, more recent than the Trachytic. The Quartz rocks, of 

 which some of the islands are largely, and others entirely composed, 

 are altered sandstones of Devonian age. 



10. " On the Sulphur Springs of Northern Formosa." By Cuth- 

 bert Collingwood, M.B., F.L.S. 



The sulphur springs are situated amongst the hills near Tamsuy 

 in the north-eastern corner of the island of Formosa, and indicate 

 the existence of volcanic action near the surface of the region, a 

 phenomenon otherwise indicated by the frequent occurrence there of 

 earthquakes. One spring possessed the character of a mountain- 

 torrent, and had a temperature of about 130°. The spot containing 

 most of the springs occupies about two acres of ground, is quite 

 barren of vegetation, and is covered with low hillocks of friable rocks 

 and debris, interspersed with shallow pits containing mud, sand, and 

 sometimes water. From cracks and fissures in these depressions 

 arose clouds of steam ; and around them was strewn a quantity of 

 sublimated sulphur, the yellow colour of which was visible from a 

 distance. 



11. "On the Geology of Benghazi, Barbary ; with an account of 

 the subsidences in its Vicinity." By George B. Stacey, Esq. 



The town of Benghazi is built on a stratum of clay, which reposes 

 on a sandy foundation. It is partially protected from the action of 

 the sea by a reef of sandstone rocks projecting two or three feet 

 above the water-level. Between the reef and the land the water is 

 now about five feet in depth, while fifty years ago this area was dry 

 land ; remains of buildings are to be seen under the water. The 

 author is therefore of opinion that the land is sinking regularly, 

 and comparatively quickly. The fundamental rock of the country 

 is a Tertiary limestone ; and the author has obtained from the neigh- 

 bourhood of Benghazi specimens of Corals, Echinoderms, Oysters, 

 Pectens, and on the surface Cardium edule. 



