44 BIOLOGICAL SURVEY OF 



affects this Region is the Union River, which flows into the 

 Western Bay and has carried down the silt that has covered 

 the beaches on the western side of the Island. The mud of 

 the inner Bay is from the erosion of the clay banks of the 

 shores which are constantly being worked upon by the ice 

 which the tide moves. 



However, wherever there is sand present, even in a small 

 quantity, there is an immediate increase in the number of 

 molluscs. This is particularly noticeable in the region be- 

 tween Buttons and Greenings islands, where in some cases 

 there is more sand than mud. There the dredge will bring 

 up a great number of molluscs and where more occur than in 

 any other place. One dredging there has produced twenty- 

 two species of molluscs alone, a thing that would not happen 

 in any other part of the Region. 



Figure 4 is a chart on which we have marked out in a 

 general way the different types of bottom as we have found 

 it from the dredging. It gives a far better idea of the Region 

 than would a description in words. At the same time, we 

 wish to draw attention to several features that will assist 

 anyone looking for forms. From the chart it will be seen that 

 there is not much use to dredge around in the middle of 

 either the inner or outer Bay, for most of the forms are found 

 near shore or near one of the hard-bottom or ledge areas. 

 Particular attention should be paid to the blue clay patches 

 which are extremely rich in fauna. While dredging patches 

 along the edges, one can get all of the forms that would be 

 found in the middle parts of the Bay. 



The distance from the north side of the Island around to 

 the western side prevented much work being done there, 

 because the channel at the Narrows is filled up and is com- 

 posed mostly of mussel beds and it is only at high tide that a 

 boat may go through; therefore, one has to go all the way 

 around the south side and return, making the trip too long. It 

 is hoped that at some future time we may take this western 

 territory and by making a temporary headquarters there for 

 the boat, explore it thoroughly. Had this been attempted 

 while working on other portions the amount of time con- 

 sumed would have interfered seriouslv with the work. 



