312 PROCEEDINGS OFTHE GEOLOGICAL SOCIETY. [DeC. 13,1848.] 



Postscript. — In addition to my own limited observations on the Trias 

 of the Venetian and S. Tyrolese Alps (p. 165), I intended to have re- 

 ferred my readers to the illustration of the rocks and fossils of that 

 age contained in the work of Professor Catullo, " Prodromo di Geo- 

 gnosia paleozoica delle Alpi Venete. Modena, 1847." Besides the 

 common muschelkalk species cited in the precedmg pages. Professor 

 Catullo figures and describes several new species, and also the inter- 

 esting triassic plant Voltzia hrevifolia (Brong.). He further enu- 

 merates many fossils of the Jurassic and cretaceous groups of that 

 region, and figures their Cephalopoda. I cannot pretend to decide 

 authoritatively a point on which this author insists — that certain 

 species are common to the Upper Jura and Neocomian ; but whilst 

 I should be very sorry to do injustice to so experienced a naturalist 

 as Professor Catullo, I must repeat, that wherever I have examined 

 a tract in which there was a clear geological succession, there also 

 the accompanying zoological distinctions indicated by M., de Zigno 

 seemed to me to be equally clear. In cases of this nature everything 

 depends upon correct definitions of the relations and order of the 

 strata. Professor Catullo also describes five species of nummulites 

 from the tertiary rocks of the Vicentine, but I must leave others to 

 determine how far these forms have been named by previous authors. 

 In another work (" Cenni sopra il terreno di sedimento superiore 

 Venezia. 1847."), Professor Catullo figures a number of tertiary 

 corals. 



I have just received a new geological map of the environs of Vienna 

 by M. Johann Czjzek, in which the author represents the "Wiener 

 Sandstein" as older than the Alpine (Jurassic?) limestone ! I have 

 not suflficiently re-examined that tract to be able to controvert this 

 inference, but I firmly hold to the facts stated in the preceding 

 memoir; and as the Bavarian "flysch" is unquestionably, like that 

 of Switzerland, supracretaceous, it is for the Austrian geologists to 

 show that their "Wiener Sandstein" is neither a prolongation of the 

 same deposit, nor even an arenaceous development of any portion of 

 the cretaceous system. 



