184 



J. E. G. Raymont 



MACOMA 



SCTOBICULARIi 



CAR0IUI4 MYTIUS NEPMTHYS_ JCREIS _ ARENICOLA _ HE.TIROMASTyS^ _ f YGOSPIO 



, CHIRONOMIDS OLIGOCHAETES 



Fig. 2. The distribution of the more important lamellibranchs and polychaetes; also of chironomid 

 larvae and oligochaetes. Along each transect, the stations are taken as equidistant down the shore, 

 St. 1 being near high water mark. The numbers are densities per m^ calculated as averages of the 

 populations of 6 sampling dates. Note : A different scale has been used for Pygospio in Transect 4 



that Transect 4 was generally on a somewhat lower level of the shore. Nephthys, 

 for example, was commonest at the mid-station of this Transect instead of at the lower 

 station. Heteromastus also appeared to be reaching its maximum density at the high 

 level of the shore in Transect 4, whereas in Transects 1-3 Heteromastus was absent 



Table VII 

 The distribution of Hydrobia ulvae over North Bay. The population of each station is 

 expressed per m^ and represents the average of the 6 sampling dates. Numbers in 

 brackets are rounded figures based on averaging 3 July samples 



