On tlie Molliisca between tide-marks at tlie coasts 
of Iceland. 
By 
A, C, Johansen, M. Sc. 
In summer 1900 I speut a time in collecting molluscs in the 
tract between tide-marks and above tbe 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: 
Acmæa testudinalis, Miill. 
Littorina rudis, Maton. 
Littorina ohtusata, L. 
Littorina ohtusata arctica, Møller. 
Pur pur a lapillus, L. 
Mytilus edulis, L. 
III. 1—2 meter below the high water mark: 
Boreochiton ruher^ Lowe. 
Acmæa testudinalis, Miill. 
Margarita helicina, Fabr. 
Littorina rudis, Maton. 
Littorina obtusata, L. 
Vidensk. Meddel, fra den naturh. Foren. 1902. 
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