Table 27G.— Bathymetric occurrence of Corbula krebsiana, 



Table 274. — Bathymetric occurrence of Hiatella arctica, 



based on 



41 



samples 



and 97 specimens. 





based 



or 



149 



samp 



les 



and 3,474 



specimens. 















Percentage 



of 

















Percentage 



of 





Depth range (m) 













Depth range 



(mj 





















Samples 





Specimens 



Samples 





Spi 



=cimens 



0-24 







9.8 





6.2 



0-24 













2.0 







2.3 



25-49 







63.4 





55.7 



25-49 













22.8 







68.8 



50-99 







21.9 





35.0 



50-99 













51.0 







24.1 



100-199 







4.9 





3.1 



100-199 













21.5 







4.7 



200-499 







— 





— 



200-499 













2.7 







0.1 



500-999 







-- 





-- 



500-999 













— 







-- 



1000-1999 







— 





— 



1000-1999 













— 











2000-3999 







— 





— 



2000-3999 













— 







— 



Total 







100.0 





100.0 



Total 













100.0 







100.0 



Table271. —Occurrence of Corbula krebsiana in bottom 



sediments, based on 41 samples and 97 specimens. 



Table 275. — Occurrence of Hiatella arctica in bottom sediments, 

 based on 117 samples and 3,353 specimens. 



Bottom type 



Percentage of 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



Samples 



4.9 

 29.3 

 63.4 



2.4 



100.0 



Specimens 



3.1 

 36.1 

 58.7 



2.1 



100.0 



Bottom type 



Percentage of 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



Samples 



29.0 



23.9 



12.0 



2.6 



6.0 



12.0 



7.7 



1.7 



5.1 



100.0 



Specimens 



61.4 

 20.0 

 4.1 

 1.8 

 2.1 

 9.7 

 0.6 

 0.1 

 0.2 



100.0 



Table 272. — Bathymetric occurrence of Hiatellidae, 

 based on 7 samples and 17 specimens. 



Table 276. --Bathymetric occurrence of Panomya arctica, 

 based on 19 samples and 64 specimens. 







Percentage 



of 



Depth range (m) 











Samples 





Specimens 



0-24 









25-49 



57.1 





29.4 



50-99 



28.6 





11.8 



100-199 



14.3 





58.8 



200-499 



-- 





— 



500-999 



— 





— 



1000-1999 



— 





— 



2000-3999 



— 





— 



Total 



100. o" 





100.0 



Depth range (m) 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



Total 



Percentage of 



Samples 



5.3 



52.6 

 26.3 

 15.8 



Specimens 



1.6 

 78.1 

 14.1 



6.2 



100.0 



Table 273. —Occurrence of Hiatellidae in bottom sediments, 

 based on 7 samples and 17 specimens. 



Table 277. —Occurrence of Panomya arctica in bottom sediments, 

 based on 12 samples and 48 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 



14.3 



14.3 

 100.0 



58.8 



5.9 

 100.0 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



16.8 



25.0 

 8.3 



8.3 

 33.3 



8.3 

 100.0 



6.2 



72.9 

 4.2 



2.1 

 10.4 



4.2 

 100.0 



165 



