Table 2 — Density estimates of benthic invertebrates larger than 5 cm. at four stations on the 

 Continental Shelf off Massachusetts in August 1965. [Values are based on scallop dredge samples 

 and bottom photographs; all densities are expressed as the number of individuals per 10,000 

 square meters of sea bottom.] 



Taxonomic group 



Station 



Martha's 

 Vineyard 



Georges Bank 



42 



Dredge Photo Dredge Photo Dredge Photo Dredge Photo 



44 



45 



PORIFERA 



COELENTERATA 



Hydrozoa 



Anthozoa 



ANNELIDA 



CRUSTACEA 



Cancer 



Pagurus 



MOLLUSCA 



Pelecypoda 



Arctica 



Placopecten 



Other 



Gastropoda 



Buccinum 



Colus 



Neptune a 



Other 



ECHINODERMATA 



Asteroidea 



Asterias 



Other 



Echinoidea 



Echinarachnius . . . . . 

 Strongylocentrotus . 



UNIDENTIFIED 



TOTAL 



20 



Number per 10,000 square meters 

 20 



50 



5 



100 



60 



5 







40 







100 



20 







1,800 



600 



1,150 



1,100 







1,800 







50 















600 



1,100 



1,100 



30 



500 



100 



200 





500 



200 



2,800 



200 



400 





50 



5,400 



200 





500 







































200 



2,800 



200 



400 





50 



5,400 













420 



4,400 



400 



4,300 





90 



3,300 













340 



2,500 







1,900 





50 



1,100 













100 



2,200 







1,700 





10 

















200 



300 







200 





10 



1,100 













40 

















30 

















80 



1,900 



400 



2,400 





40 



2,200 













20 



1,600 



200 



1,200 





20 





























600 





10 

















20 



300 













10 



2,200 













40 







200 



600 













13 



6 



,100 



920 



9,300 



100 



10,500 



31 



230 



71,800 



13 



6 



,100 



80 



6,500 



20 



2,000 





30 



2,200 



10 



1 



,500 



20 







20 



1,600 





30 







3 



4 



,600 



60 



6,500 







400 









2,200 













840 



2,800 



80 



8,500 



31 



,200 



69,600 













800 



2,800 



80 



8,500 



30 



000 



67,400 













40 















1,200 



2,200 









500 







600 







2,300 









4,300 



241 



7 



,200 



1,650 



17,100 



3,000 



18,100 



32; 



670 



85,900 



