Table 142. --Bathymetric occurrence of Thyasira croul inens is, 

 based on three samples and four specimens. 



Table 146. --Bathymetric occurrence of Thyasira equalis, 

 based on 44 samples and 309 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 



33.3 

 33.3 



25.0 

 25.0 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



4.5 

 13.6 



34.1 

 34.1 

 11.4 



2.3 



2.9 

 18.8 

 27.9 

 25.2 

 24.9 



0.3 



Total 



Total 



100.0 



Table 143. — Occurrence of Thyasira croulinensis in bottom 



sediments, based on three samples and four specimens. 



Table 147. 



-Occurrence of Thyasira equal is in bottom 

 sediments, based on 44 samples and 309 specimens. 



Bottom type 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



Percentage of 



Samples 



33.3 



33.3 

 33.3 



Specimens 



50.0 

 25.0 



Bottom type 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shel 1 



Sand 



Silty sand 



Silt 



Clay 



Total 



Percentage of 



Samples 



11.4 



31.8 



6.8 



50.0 



100.0 



Specimens 



12.3 



35.9 



3.6 



48.2 



100.0 



Table 144. — Bathymetric occurrence of Thyasira el liptica, 

 based on 4 samples and 12 specimens. 



Table 148. — Bathymetric occurrence of Thyasira ferruginea, 

 based on 92 samples and 1,381 specimens. 



Depth range (m) 



Percentage of 



Depth range (m) 



Percentage of 



Samples 



Specimens 



Samples 



Specimens 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



75.0 

 25.0 



91.7 

 8.3 



0-24 



25-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



1.1 

 1.1 



7.6 

 28.3 

 36.9 

 25.0 



0.1 

 0.1 



6.4 

 54.0 

 19.8 

 19.6 



Total 



100.0 



Total 



100.0 



100.0 



Table 145.— Occurrence of Thyasira elliptica in bottom 



sediments, based on 4 samples and 12 specimens. 



-Occurrence of Thyasira ferruginea in bottom 

 sediments, based on 92 samples and 1,381 specimens. 



Bottom type 



Percentage of 



Bottom type 



Percentage of 



Samples 



Specimens 



Samples 



Specimens 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



25.0 



75.0 

 100.0 



66.7 

 100.0 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Total 



8.7 

 26.1 

 50.0 

 15.2 



100.0 



6.4 

 45.2 



43.0 

 5.4 



100.0 



149 



