﻿SUMMARY OF THE CONTENTS. 695 



faunas is rather different; for whereas in the banks of Små- 

 lenene only V4 of the species are boreal, and ^U arctic, the 

 composition of the mollusc-fauna in the upper mya-banks near 

 Kristiania is: 10 arctic species, 10 boreal species and 5 lusi- 

 tanic species, — thus only ^/s arctic. Of the boreal species are 

 especially to be remarked cyprina islandica, macoma baltica 

 a small form of Uttorina littorea, etc, all wanting in the upper 

 mya-banks of Smålenene. On the other hand a number of the 

 most characteristic of the arctic species, common in the mya- 

 banks of Smålenene (e. g. natica affinis, Gmel. var. clausa, 

 trophon clathratus, var, major, buccinum grønlandicum, etc.) 

 are wanting in the upper mya-banks at Kristiania, and more- 

 over my a truncata is here more rare, and occurs mostly in a 

 small form with longer, thin valves, more closely related to the 

 boreal, than to the arctic form of this species. 



This comparison betvveen the upper mya-banks at Kristiania 

 and in Smålenene thus proves that banks corresponding with 

 the same percentage of uplift show a different mixture of their 

 faunas, i. e. the banks at Kristiania and in Smålenene can 

 not have been deposited at the same time, the uplift must 

 have begun earlier in Smålenene than at Kristiania. 



b. The Lower Mya-banks; the Level Corresponding to 

 25—40 o/oo of the Total Uplift. 



Pp. 258—274. 1. The Lower Mya-banks in Smålenene. 

 A number of these banks, corresponding to 26 — 40 "^/oo of the 

 total uplift, are enumerated on p. 259; the description of the 

 single occurrences follows, pp. 260—271. The banks at the locks 

 of Krappeto, not far from Fredrikshald are especially interesting 

 where a series of banks occurs from 135 — 187 metres above 

 sea-level. corresponding to 16 — 40 %o of uplift. 



The fauna of the lower mya-banks in Smålenene comprises, 

 as indicated on the table on pp. 271, 272, 45 species of shell- 

 bearing mollusca. Of these 22 are arctic, 20 boreal, and only 3 

 [cardium echinatum, abra alba and aporrhais pes pelecani) 



