402 H. E. Strickland^ Esq., on the Geology of Smyrna. 



2. A long and tranquil deposition of lacustrine matter, with shells and vege- 

 tables, in a depression between these mountains. 



3. A sudden eruption, at two principal points, of igneous matter, which 

 broke up and overlaid the deposits of the lake, and drained the greater part 

 of its waters. It seems to have been preceded by a commotion in the lake, 

 spreading non-volcanic pebbles over the bottom. 



4. A more or less sudden cessation of the igneous action, proved positively 

 by the homogeneous character of the erupted rocks, and negatively by the 

 general absence of injected dikes, or of alternate cow/ees of trachyte, tufa, &c., 

 such as are seen in Mont D'Or. 



5. A continuance of aqueous deposition in the central and lowest point of 

 the lake after the igneous eruption, proved by beds of marl, alternating 

 with gravel, containing trachytic pebbles. 



6. The drainage of this remnant of the lake by the denudation of its outlet, 

 now traversed by the Meles. 



Planorhis, similar to P. alba < 



List of Fossil Shells noticed in the Lacustrine Basin of Smyrna. 



Species. Localities. 



1. Helix, similar to H. carthusiana, Drap. . .North side of Mount Pagus. 



Ravine above Bournabat. 

 A point about 4 miles S.W. of Smyrna. 



3. Lymncea, resembling the recent L. pe- TN.E. side of Mount Pagus. 



regra ^Ravine above Bournabat. 



, ,. 11 • , ,., r Ravine above Bournabat. 



4. Paludma, a small turrited species, like K.^ ^ . , ^,, „ 



_ < N.L. side of Mount Paaus. 



the recent P. acuta 1^ , ., „, ,,, ,r. ,-i 



>- South side of the Meles, towards Boudjali. 



_ .,, rRavine above Bournabat, in company with 



5. Cmcws, a small species, like C. «M«Wa..< ,, . 



I. vegetable impressions. 



6. Unto, an ovate species N. side of Mount Pagus. 



7. Cypris Ravine above Bournabat. 



The specimens of those fossils, which were obtained, are not sufficiently 

 perfect to warrant a greater degree of precision in their determination. In- 

 deed, fossil fresh-water shells rarely possess characters sufficiently marked to 

 form the basis of accurate specific distinctions. 



