14 P. A. OYEN. M.-N. Kl. 
also find to be used in modern times, for instance, by V. NORDMANN 
(Denmark). Some biometrical values are also here added, 
Length Number Per cent 
eO NS CRT 8,0 
60— 90 » de coa PEE 46,0 
90—1IO » IUe trs OÙ 46,0 
Arca glacialis Gray. Of this species only one single specimen was 
found belonging to the well-known small and oblong variety. The length 
of it was 9,5 mm., and the height was 6,5 mm. It was highly inter- 
esting to find this species in this locality as it had formerly been found 
only in one single locality ! within the large district here in question. 
It was, however, still more interesting that it was just found in the lower 
part of layer XXIV. Certainly, however, it did not originally belong to 
this layer as is clearly proved, as well by the nearly littoral character 
of this deposit as by the character of the complex fauna of this layer, but 
it must have been washed out from the underlying clay layer XXIII. 
Cyprina islandica L. This species was along with Zirphaea cris- 
pata L. discovered as new of this locality by my little son Tor, who 
with great interest took part of collecting fossils also in this place. 
Only one single specimen was found of each of those species. The 
length of the shell of Cyprina was 60 mm. 
Tridonta borealis CHemn. Of this species only two specimens of 
length 34 mm. were found belonging to forma typica. 
Astarte sp. A couple of specimens of length 22 mm. was much 
alike to Tridonta borealis and they are certainly very near allied to this 
species, but must be referred to the species, which I have described on 
a former occasion’. This species might be regarded as comprising two 
different varieties, the one tending to borealis, the other one to com- 
pressa. The two specimens above mentioned are to be referred to the 
first one (a), and five other specimens of length 19—24 mm. are to be 
classed with the other one (3). Specimens of the last mentioned variety 
I have found to be living near Mehavn. Sometimes, this variety may 
assume a rather globose shape thus approaching to Nicania banksii, or 
even to Astarte laurentiana. 
Astarte compressa L. This species occurred in a great many varie- 
ties, either nearly smooth, or concentrically ribbed, the ventral edge being 
either thickened or more flattened. Some biometrical values are added, 
Oyen: Nogle bemerkninger om ra-perioden i Norge, 1911, p. 30. 
P. A. 
P. A. Öven: Kvartær-studier i den sydøstlige del av vort land, 1908, p. 104. 
