﻿704 



SUMMARY OF THE CONTENTS. 



4- y Cf : y 6 : -;- y ;. 



All of Ihem are known from older occurrences (the ostræa-banks, 

 etc.) except the following five species: terebratulina caput ser- 

 pentis, antalls entalis, tapes decussatus, t. aureus, t. virgineus. 



The most common species are: ostræa edulis, mytilus 

 edulis, different species of the genera astarte, cardiwm etc, 

 timoclea ovata, littorina Uttorea and other species of littorina, 

 nassa reticulata, bittium reliculatum, aporrhais pes pele- 

 cani, etc. 



The character of the fauna indicates a climate somewhat 

 milder than that from the time of the uppermost ostræa-banks. 



A description of the various occurrences follows on pp. 

 393 — 400. — For the distribution of panopæa norvegica, see 

 pp. 398, 399. 



Pp. 400—446. The Upper Tapes-banks in the Kristiania 

 Region (apart from the Kristiania Valley). 



Outside the narrow Drøbak Sound, the upper tapes-banks 

 are much more richly developed than in the Kristiania Valley; 

 and a great number of occurrences are known. The most im- 

 portant are enumerated in the lable on p. 402, to the number 

 of 23. 



The various occurrenses are described on pp. 402 — 439. 

 The shell-banks of Barholmen near Drøbak are of special interest 

 (pp. 403—406) as well as those of Kirkeø, Hvalør (pp. 403—406), 

 further, the shell-banks in the environs of Brevik (pp. 414—421), 

 investigated by Miinster, and finally the shell-banks in the envi- 

 rons of Skien (pp. 425 — 432), investigated by M. Sårs, etc. 



A complete table of the hitherto known mollusca of the 

 upper tapes-banks of the Kristiania region is given on pp. 439 

 —444. This list comprises 216 species of mollusca, of which 

 34 are arctic, 89 boreal, and 93 lusitanic, or in proportion : 



+ ya:^y6:+yZ. 



