﻿SUMMARY OF THE CONTENTS. 709 



Upper bank 

 Lower bank , 



Common to both banks . 12 33 33 78 



Still more instructive are the relations between the different 

 shell-banks at Brevik. As shown by the table^ on p. 518, the 

 number of species has regularly increased from the upper banks 

 (representing ca. 66 ^/oo of total uplift) with 37 species, to the 

 lowest bank (corresponding to 88 — 97 ^/oo of total uplift) with 

 162 species. The number of arctic forms throughout the banks 

 is about the same (6 — 13); the number of boreal forms has in- 

 creased considerably (from 18 to 61), hut not nearly so much 

 as that of the lusitanic species (from 13 to 88). The proportions 

 of arctic, boreal, and lusitanic forms show also a regular change 

 from the upper to the lowest banks, the number of the ratio for 

 the lusitanic species increasing steadily, that of the boreal de- 

 creasing steadily (in spite of the increase in the actual number 

 of boreal species). 



A table of foraminifera, ostracoda, etc. from the lower tapes- 

 banks at Brevik, is given on pp. 520—522. 



Pp. 522 — 550. 2. The Lower Tapes-banks elsewhere than in 

 the Kristiania Region. 



Corresponding shell-banks are known in Bohuslan and Hal- 

 land, Sweden (p. 523), and in Denmark (pp. 524, 525). 



On the Norwegian south coast a number of corresponding 

 banks are known. 



In the environs of Kragerø (pp. 525 — 532; the occurrence 

 at Kalstadkjern with 85 species, of which cardium tubercula- 

 tum is to be noted as not otherwise known on the Norwegian 

 coast) ; at Askerø at Lyngør, Tvedestrand (pp. 532 — 534) ; at 

 Tromø (Alvekilen, Storeng, etc.) at Arendal (pp. 534, 535); in 



' In the table the Norwegian term, Høide o. h., indicates Height above 

 sea-level, pre. af stign. = percentage of total uplift, antal arter = 

 number of species, and fælles arter = species common to two shell- 

 banks. 



