﻿694 SUMMARY OF THE CONTENTS. 



230). The species of huccinum are also very significant; the 

 typical high-arctic species of this genus are wanting, whereas 

 boreo-arctic varieties of boreal species (e. g. var. coerulea, etc. 

 of h. undatum, and several transition-forms between 6. unda- 

 tum and b. grønlandicum) are very comnion. The common 

 occurrence of mytilus edulis the blue mussel is characteristic. 

 This boreal shell, as mentioned above, is wanting in the littoral 

 zone of the high-arctic coasts. On the other hand, the size and 

 the forms of most of the species " are such as we find at the 

 Southern limit of the arctic region. All evidence thus shows 

 that the climate during deposition of the upper mya-banks in 

 Smålenene has been not a high-arctic, but a boreo-arctic one, 

 such as we find to-day along the coast of Finmark in Northern 

 Norway. 



The shell-banks of this group with which we are acquainted 

 are enumerated on pp. 239, 240; most of them are situated 155 

 — 130 m. above sea-level, by an upper marine boundary of ca. 

 175^ — 160 m. above sea-level, corresponding to about 6 — 16 °/oo 

 of uplift. A few occurrences (described on pp. 242, 243) are 

 known on levels closely below the upper marine boundary in 

 Smålenene; they are very insignificant, while the shell-mass of 

 some of the others shows a thickness of 3 — 3V2 metres, indicating 

 a long rest, or very slow rise of the shore-line during their 

 formation. 



Pp. 244 — 257. 2. The Upper Mya-banks In the Environs 

 of Kristiania. From the vicinity of Kristiania only few (8) 

 littoral shell-occurrences from the first part of the rise of 

 the land are known; they are enumerated on p. 245, and 

 correspond to an uplift of ca. 9 — 25 °/oo. The fauna of these 

 occurrences, indicated on pp. 250, 251 and 256 comprises 25 

 species of mollusca, thus about the same number as that of the 

 upper mya-banks in Smålenene. But the character of both 



^) In this and all foUowing tables the terms: „Høide o. h." indicates: 

 Level above the sea; „Øverste mar. gr." indicates: „Upper marine 

 boundary"; „Prc. af stign." indicates: „Percentage of total uplift". 



