1912. No. 8. THE QUATERNARY SECTION OF KILEBU. 17 
Margarita groenlandica CHEmx. forma typica; the diameter of this 
species had a length of 11 mm. 
Margarita cinerea CovrH. was above mentioned as occurring in the 
lower half of layer XXIV. The diameter of the shell was 5 mm. 
Gibbula sp. This species is to be regarded as G. cineraria L., but it 
belongs to an aberrant type the diameter of which is 9 mm. 
Gibbula sp., var. intermedia, is to be regarded as an intermediate type 
between G. cineraria and G. tumida; it is, however, to be referred, as 
a variety, to the last mentioned species. The diameter is 10 mm. The 
number of this variety was thirty two. 
Gibbula tumida Mont. forma typica had a diameter of 9 mm. and 
occurred in I4 specimens. 
Natica clausa Brop. & Sows. This species was very numerous and 
was represented by many different varieties shading into each other. 
The most numerous form was forma typica, but, there were also found 
specimens belonging, as well to forma elator Mippenp. as to var. affinis 
GMEL., and a couple of specimens even proved to approach to Lunatia 
groenlandica Beck as to the outer shape. Judging merely from the 
appearance of the shell, however, we may be justified in regarding them 
all as belonging to the very same genetic series. The biometrical values 
show the relative size and number, 
Length Number Per cent 
t pim uper hehe 6 1,4 
5—10 » Vote C 35 8,5 
I0—15 » Le Po 122 29,5 
15—20 » AAA 223 53,9 
20 » M BER tee I3 3,0 
Zio 6 1,4 
32 —» 5 1,2 
23 » SEN oe ee 2 0,4 
24 » ES REE I 0,2 
25 ^3» Een t I 0,2 
Littorina littorea L. A very fine specimen of the prominent type 
of this species was found to be of length 19 mm. This species was of 
quite the same type, which I have described on several former occa- 
sions, for instance, Graakammen (L. — 13 mm.)!, Ryenvarde (L. — 13 mm.)? 
P. = YEN: Skjælbanker i Kristianiatrakten, 1906, pp. 90— 92. 
E. 
19 
A. 
A. OYEN: pw i Kristianiatrakten, 1906, pp. 88— 9o. 
Vid.-Selsk. Skrifter. I. M.-N. Kl. 1912. No. 8. 2 
