CONTENTS. 



Page 



Introductory Part t 



Historical i 



Remarks on the Stratigraphy of the Kristiania Region 6 



State ot Preservation of the Fossils g 



Description of the Fossils 12 



Genus Raßiicsquina 14 



— Sirophcodonta 33 



— Palacostrophoiiirrta 43 



— Strophonieiin 44 



— Strophonella 63 



— Schucherfclla 67 



— Leptaena 69 



— Plectanibonitrs 7^ 



— Christiania 85 



— Triplecia 86 



— Strepiis 87 



General Results 89 



List of the Stro(>hoiii£)iidnc of the Kristiania Region with their Place in the Strati- 

 graphical S^-stem 89 



Evolutionary Evidences with Remarks on the Classification of the StropUoiuenidae 91 



Occurrence of the Strophomenids in different Kinds of l^^ock 103 



Relation of the Strophomenids of the Kristiania Region to those of some Foreign 



Countries 107 



Explanation of Plates no 



