132 
MARINE FAUNA OF ST. ANDREWS. 
Genus Spirorbis, Daud. 
Spirorbis borealis , Daud.; Mgrn. op. cit. p. 122. 
Abundant on seaweeds and stones between tide-marks. 
Spirorbis lucidus , Mont.; Mgrn. op. cit. p. 123. 
Common on zoophytes from deep water. 
