12 P. A. ØYEN. M.-N. Kl. 
When leaving the layer XXIII we are confronted with a series of 
quite another character than the preceding ones. Instead of the horizontal 
strata of the previously passed layers we find the layer XXIV to be 
composed of inclined strata, dipping about forty degrees in a northerly 
direction, At the same time we find, as well the material of the terrace 
as the enclosed fossils, to be of nearly a littoral character. Moreover, 
these fossils prove to represent the first post-glacial immigration of the 
fauna of more temperate seas. 
Description of fossils. 
A certain part of the fossil-bearing terrace was examined in such 
a way that material might be obtained for a biometrical analysis. The 
result of this investigation may be embodied in the following description. 
Anomia ephippium L. Of this species forma typica was the most 
common, but specimens of the varieties cylindrica and hemisphaeroidea 
were by no means rare. Some specimens of var. squamula were also 
seen. The total number of those typical varieties was 186. There also 
occurred a variety striated in such a manner as to be somewhat similar 
to 4. patelliformis, but, on nearer inspection, it proved to be var. elec- 
trica, and among the 16 specimens of this type were also found as well 
cylindrical forms as hemisphaeroidal ones. A peculiar variety that might 
be designated as var. elongata formed a most odd and particular addition 
to the anomias; in one case the outer shape was nearly rectangular 
with a length of 18 mm. and a breadth of 8 mm. The maximum length 
of this variety was 23 mm. Beside the three more typical forms of 
this variety there was also found one specimen of a transitional type 
and one specimen of an odd type being elongated in the transverse 
direction measuring 22 mm. in breadth. Taking a view of the mean 
size of the anomias we find it most common to be of about half the 
size of the above mentioned maximum. 
Anomia aculeata L. occurred in the typical form of length 13 mm. 
As a rule, however, it was somewhat smaller. This species also some- 
times occurred in specimens of a cylindrical shape. 
Pecten islandicus MürL. occurred, as a rule, in forma typica. Some 
very small specimens had an outer appearance that made them look 
somewhat similar to varius, but, even with these small specimens the sur- 
face of the shell proved to be nicely reticulated between the ribs in the 
usual characteristic manner. In some specimens five or seven ribs have 
a more prominent development than the other ones, so as to give these 
specimens an appearance somewhat similar to septemradiatus. In some 
