BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 3. N:0 12. 29 



several thin laminae, while in the Lower Silurian strata the 

 forms with a compact, calcareous shell have a great preponde- 

 rance. Among the generic types Kutorgina, Acrothele and 

 Iphidea seem to be the most characteristic, none of them being 

 hitherto, with certainty, fouud in rocks of younger age than the 

 Paradoxides period. 



As hitherto no full account in one place has been given 

 of the faunae of the Swedish Primordial zone, I here subjoin 

 a list of the species described up to this day from the Para- 

 doxides beds of Sweden. Several undescribed species occur, 

 but of these I will only refer to a few of the more important. 

 The works in which the species have, under the names used 

 in the list, been first described or mentioned as occurring in 

 Sweden or any of the other Scandinavian countries are the 

 following: 



Ang. 1851, 1854. Angelin, Palseontologia Scandinavica, fasc. 



I 1851, fasc. II 1854. 

 Brongn. 1822. Brongniart, Histoire naturelle des Crustacés 



fossiles. 

 Dålm. 1828. Dalman, Årsberättelse etc, afgifven den 31 Mars 



1828. 

 LiNRS. 1869. LiNNARSSON, Om Vestergötlands Cambriska och 



Siluriska aflagringar (K. Vet. Akad. Handl. Bd 8, N:o 2). 

 LiNRS. 1872. LiNNARSSON, Om några försteningar från Sveriges 



och Norges "Primordialzon" (Ofvers. af K. Vet. Akad. För- 



handl. 1871, printed 1872). 

 LiNRS. 1875. LiNNARSSON, Ofversigt af Nerikes öfvergångsbild- 



ningar (Ofvers. af K. Vet. Akad. Förhandl. 1875). 

 Nath. 1869. Nathorst, Om lagerföljden inom kambriska for- 

 mationen vid Andrarum i Skåne (Ofvers. af K. Vet. Akad. 



Förhandl. 1869). 



Sjögr. 1872. Sjögren, Om några försteningar i Olands kambri- 

 ska lager (Geol. Fören. Förhandl., Bd 1, N:o 5). 



T. Seeb. 1865. v. Seebach, Beiträge zur Geologie der Insel 

 Bornholm (Zeitschr. der Deutsch. geol. Gesellsch., Bd XVII). 



Tor. 1870. Torell, Petrificata Suecana Formationis Cambrica^ 

 (Acta Universitatis Lundensis for 1869, printed 1870). 



V v 



