H L8 \M' < \I.<" EB La 



tdyanl sidei at ;i distance from 1 1 1 « - fields of research, the 



results have appeared t<> be sufficiently novel and to warrant publica- 



l iched have been just what one might have anticipated from 



ng upon the basis of the theorj of evolution and monogenesis, 

 but nevertheless have not been admitted without much besitation, because of the 

 author'- natural feeling that bo great exactitude in statement with regard to 1 1n* 

 relal faunas on the same horizon Bhould be distrusted 



ir data have led us correctly, there are some basins in the Lowei I - 

 which were capable of evolving new forms. These we have called Aldainic 1 



they were centres of origin for new Beries, and their faunas were 

 what we have called Autochthonous Faunas. Other basins were apparently 

 incapable of giving origin t<> new forms, or at any rate received all, or almost 

 all. tin- forms which occupied their territory by migration from the aldainic b 



we have called Analdainic or Residual Basins, ami their faunas Residual 

 or Analdainic Fauna-. The beginning of the Arietidse was in tin- Northeast- 

 ern Alps, and this, being tin' first autochthonous fauna, was older than all others. 

 Thence South Germany or Suabia was peopled l>\ chorological migration, and 

 then tin- basin of the Cote d'Or. Thus a Zone of Autochthones, or an aldainic 

 band of basins, was formed running to the westward. North and south of this 

 /on.- :ill • :n to have been residual faunas. 



The fauna of tin- Lower I.Ms jn the basin of the Northeastern Alp- was, bow- 

 not in the /on.' of autochthones after the deposition of the Angulatus bed. 

 This zone, just before the deposition of the Lower Bucklandi bed, had become 

 narrowed in it- easterly extension, and confined to the I South Germany 



and the < 



PsiLCK ERAS LND CaLOCER iS. 



I icovery by Gtimbel 1 of /' in the ti the 



\l|i- having been confirmed by Winkler 1 and the -hell and sutures 



hi be no doubt that it is a true P Asa result of our 



ipon cycles of form, we can, however, unhesitatingly assume that this 



shell is too involute to be considered a radical of the Arietidse It indical 



ling to the usual history of these cycles, that undiscovered species 

 P niii-t have existed in the Trias, as necessary an tece- 



. forms. Two forms have also I n cited by Neumayr, in his 



I . / ' i thi Koww ie r 



l ne from Wallegg, and appear to be the same a- those previously 



and later described by VTTahner. 1 Wah- 

 : insiders them both to In- -| imens of bis /' /.' 



-..w 

 V 



V 1 1. 1 II 



« VerbaoJ gsol. 1. 



IS 



