On the Mollusca between tide-marks at the coasts 
of Iceland. 
By 
A. 0. Johansen, M., Sc. 
In summer 1900 1 spent a time in collecting molluscs in the 
tract between tide-marks and above the high water mark at the 
west coast of Iceland. The species which I found in a living state 
at the different levels were as follows: 
I. Above the high water mark: 
Littorina rudis, Maton. 
II. 0—1 meter below the high water mark: 
AÅcmæa testudinalis, Mill. 
Littorina rudis, Maton. 
Littorina obtusata, L. 
Littorina obtusata arctica, Møller. 
Purpura lapillus, L. 
Mytilus edulis, L. 
III. 1—2 meter below the high water mark: 
Boreochiton ruber, Lowe. 
AÅcmæa testudinalis, Mill. 
Margarita helicina, Fabr. . 
Littorina rudis, Maton. 
Littorina obtusata, L. 
Vidensk, Meddel. fra den naturh. Foren. 1902, 
