Table 174.--Bathymetric occurrence of Pteromeris perplana, 

 based on 14 samples and 28 specimens. 



Table 178.— Bathymetric occurrence of Astarte castanea, based on 

 105 samples and 457 specimens. 



Depth range (m) 



Percentage of 



Samples 



Specimens 



Depth range (m) 



Percentage of 



Samples 



Specimens 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



21.4 

 78.6 



10.7 

 89.3 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



22.8 

 36.2 

 36.2 



4.8 



30.4 



33.7 



34.6 



1.3 



Total 



Total 



100.0 



Table 175. — Occurrence of Pteromeris perplana in bottom 



sediments, based on 14 samples and 28 specimens. 



Table 179.— Occurrence of Astarte castanea in bottom sediments, based 

 on 94 samples and 384 specimens. 



Bottom type 



Percentage of 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shel 1 



Sand 



Silty sand 



Silt 



Clay 



Total 



Samples 



7.2 



14.3 

 21.4 

 57.1 



Specimens 



3.6 



7.1 

 35.7 

 53.6 



Bottom type 



Percentage of 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



Samples 



4.2 

 13.8 



3.2 



9.6 



64.9 



3.2 



1.1 



100.0 



Specimens 



2.1 



24.2 



1.6 



7.5 



63.3 



1.0 



0.3 



Table 176. — Bathymetric occurrence of Astarte boreal is , based on 

 18 samples and 22 specimens. 



Table 180. — Bathymetric occurrence of Astarte crenata subequi latera, 

 based on 433 samples and 4,972 specimens. 



Depth range {m} 



Percentage of 



Samples 



Specimens 



Depth range (m) 



Percentage of 



Samples 



Specimens 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



11.1 

 88.9 



9.1 

 90.9 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



0.2 



4.2 



32.6 



41.1 



21.2 



0.7 



0.1 



7.7 



35.8 



44.7 



11.5 



0.2 



Total 



100.0 



Total 



100.0 



100.0 



Table 177. — Occurrence of Astarte borealis in bottom sediments, based 

 on 17 samples and 21 specimens. 



Table 181— Occurrence of Astarte crenata subequilatera in bottom 

 sediments, based on 391 samples and 4,649 specimens. 



Bottom type 



Percentage of 



Samples 



Specimens 



Bottom type 



Percentage of 



Samples 



Specimens 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



35.3 

 35.3 



5.9 

 23.5 



28.6 

 42.9 



4.7 

 23.8 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shel 1 



Sand 



Silty sand 



Silt 



Clay 



Total 



14.3 



11.3 



21.7 



1.8 



0.5 



17.9 



16.9 



2.8 



12.8 



100.0 



14.6 

 2.1 



49.3 

 0.7 

 0.5 



13.6 



12.9 

 1.2 

 5.1 



100.0 



153 



