8 P. A. ØYEN [No. 3 



electrica F. & H., the muscular impression being, however, deci- 

 sive as to the determination of the species. 



Pecten septemradiatus Mull. 



Pecten tigrinus Mull. 



Pecten islandicus Mull. 



Area glacialis Gray. Three broken specimens were found 

 to belong to a smaller and more longitudinally eompressed 

 variety than the one just mentioned above. 



Cardium echinatum L. 



Cyprina islandica L. occurred in numerous specimens 

 measuring about 95 mm. 



Axinus flexuosus Mont. 



Abra alba Wood. 



Abra longicallis Sc. This species was enumerated already 

 in the preceding group in which it, no doubt, is to be regarded 

 as actually invading as a deep-water mollusc. It is, however, 

 highly interesting that we are really in this locality confronted 

 by a long series of intermediat e forms between Abra longicallis 

 and alba, proving that this species invaded as a deep-water 

 animal that in time crept up and accommodated for the littoral belt. 



Macoma calcaria Chemn. invading at this locality quite 

 early in the age of the Ra-stage has certainly survived through 

 the following periods, even under more unfavorable conditions 

 that made the shell diminish in size whilst at the same time the 

 thickness of the shell conspicuously decreased. 



Saxicava sp. This species occurred in arather great profusion, 

 for the most part in juvenile specimens of the variety pholadis L. 

 Some of the specimens were rather much distorted and may in 

 part also include the variety arctica L. so characteristic to a 

 great many deposits of the Ra-stage. 



Antalis entalis Lin. 



Antalls striolata Stimps. This species was mentioned as 

 probably invading already in the time of the Eidsberg-division. 



Boreochiton ruber Lowe. 



Boreochiton marmoreus Fabr. 



