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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 22, 



and water, the sea rushed into the newly-made depression, forming a 

 deep inlet or sestuary, in which, for a time, marine life alone existed, 

 until the conditions of life being again altered, and the waters having 

 gradually become brackish, the true marine fauna also disappeared, 

 and was replaced by one adapted to the altei-ed conditions of life. 



How, and where, and when these changes may have taken place, 

 are questions which must be deferred to the concluding portion of 

 this paper. We have now to compare the fossils of the marine sand 

 of Weinheim with those of other tertiary deposits, and to endeavour 

 by means of such comparison to ascertain their relative age and 

 position with regard to the other tertiary beds of Europe, as well as 

 their absolute place in the tertiary system. 



The following list of fossils in the Marine Sand of Weinheim is 

 chiefly taken from that given by Dr. Sandberger in his last-published 

 work. 



Table I. 



Tabular view of the Mollusca of the Marine Sands of the Mayence 

 Basin, showing some of the other localities where they have been 

 observed. 



Teredo anguinus, Sandb., n.s 



Saxicava, 3 or 4 species, undetermined 



Leguminaria papyracea, D'Orb 



Solecurtus appendiculatus, DesmouL... 

 PanopEea intermedia, Soiv 



= P. Hebertiana, Bosq. (? the same) 



Thracia phaseolina, Kiener 



Corbulomya polita, A. Braun 



= C. complanata, Nyst. 



Corbiila pisum. Sow 



striata. Lam 



scalaris, A. Braun 



Tellina donacina, L. ? 



Hebertiana, Bosq 



= T. Benedenii. 



, 2 species undetermined 



Crassatella Bronnii, Merian 



Astarte plicata, Merian 



, species undetermined 



Diplodonta fragilis, A. Braun 



Lucina Bronnii, Merian 



— L. squamosa, Lam. 



Galeottiana, Nyst 



lepida, Bosq 



uncinata. Desk 



tenuistria, Hp'b 



commutata, Phil 



= L. diparicata,var. Nyst. 

 saxorum. Lam 



Belgium. 





.= ■5 J 



