1913] TRANSITIONAL QUATERNARY STRATA 11 



Pecten septemradiatus Mull. was not rare. This species 

 occurred as well in forma typica as in a smaller and more 

 delicate variety. 



Mytilus edulis Lin. forma typica. 



Leda pernula Mull. forma typica. 



Portlandia lenticula Moll. forma typica was rather com- 

 mon. One specimen being of a quadri-fasciate type had a length 

 of 6 mm. and proved to possess eleven teeth in the front portion 

 of the hinge and twelve teeth in the caudal one. In some speci- 

 men s of a more ovate shape some eharacters may be seen re- 

 minding one of /. intermedia. 



Area glacialis Gray forma typica of quite the same type 

 as that being the leading fossil of the Sveneng stage. 



Cardium edule Lin. forma typica, but rather small. 



Axinus flexuosus Mont. forma typica. 



Abra nitida Mull. was not rare. 



Antalis striolata Stimps. forma typica. This species was 

 rather common but only occurred in relatively small specimens. 



Siphonodentalium vitreum Sårs was rather rare and only 

 occurred in Ihe small and rather delicate var. striata. 



Of course, when we take into regard that the quaternary 

 section of Bentse only opens to us the contents of deep-water 

 layers there might be some room for opposition to the explana- 

 tion given on the above pages. But, on strictly viewing the 

 series of clay- layers and the pronounced order of stratigraphical 

 record as fixed by the different fossil assemblages it might, 

 however, be very difficult to explain the whole character of the 

 series in any other way than that of the preceding exposition. 



At least, I venture to suppose that the explanation given 

 above is a quite suitable one to form the base of a w o r k i n g 

 hypothesis. 



Printed June 18. 1913. 



