1898—1902. No. 20.] 
BRACHIOPODS AND MOLLUSCS. 7 
Very common; at the last-named dredging station nearly 600 speci- 
mens were obtained. 
The specimens, which have a length of up to 23 mm. belong partly 
to the variety portlandia, Hrrcucock and partly to the variety siliqua, 
Reeve. The majority belong to intermediate forms. I append some 
measurements of specimens which were taken at the same time at the 
head of the Gaasefjord: 
Long. 23. mm. Lat. 13.5 mm. Crass. 10.2 mm. 
995, 18, 95 , 
99.2, 107. 87, 
2 , 13, 10.5, 
5 , 122, ae 
WAS , 12.5, 95 , 
a, 125, Ss . 
90.7. 125, 9 , 
0.5 13, a 
0. ito; Se: | 
19.5. ie 2 73 4 
9. 125, 8.5 
18 « 122, B 4 
7 105, 65 , 
Thus in these specimens the height of the shell is 56.74—67.78 %/, 
of the length and the breadth 35.34—47.73 °/) of the length: in some 
other specimens I have found moreover that the breadth of the shell 
can be as much as 49.11 °/> of the length. 
Yoldia hyperborea, Lovrn. 
Locality: 
Aug. 18. 1898. Bay near Rice Strait. 
Sept. 19. 1900. Off Forvisningsdalen, Gaasefjord, 4-40 m. Clay with small stones. 
Sept. 20. , The head of the Gaasefjord, 6-40 m. Clay with small stones. 
Aug. 2 1901. a _ _ , about 40 m. 
The species seems to be very scarce, since not more than at most 
3 specimens have been found at any locality. 
The specimens quite accord with specimens from Spitzbergen and 
Novaya Zemlya in the Bergen Museum. The height of the shell varies 
between 49.3 /) and 55.9 °/, of the length, while its breath (thickness) 
is between 25°, and 31 °/o of its length. In a specimen 31 mm. long 
there were anteriorly 25 hinge-teeth and posteriorly 20 hinge-teeth. In 
a specimen 25 mm. long the number of hinge-teeth were 24 and 20 
