182 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



These represent : — 



1°. Samples of the sea bottom at and about the 

 "Deposit buoy." (See map on page 171). 



2°. Samples of the sea bottom near the Rock Channel 

 (No. 7 buoy). 



3°. Samples of the deposit found in gutters on the 

 edge of the Burbo Bank at low tide. 



4°. Material taken from a "Hopper" in the Man- 

 chester Ship Canal. 



5°. Samples of shrimps caught near the Deposit buoy. 



6°. Samples of young flat fish caught near the 

 Deposit buoy. 

 " These have all been carefully examined in the Sea- 

 Fisheries Laboratory, and microscope preparations of the 

 various substances have been made and compared. 

 The examination has shown : — 



1°. That there is comparatively little fine mud or 

 dirty material at the Deposit buoy. The 

 bottom appears to consist largely of coarse 

 crystalline sand. 



2°. At No. 7 buoy the deposit is dirtier, and has 

 more mud and amorphous decomposing 

 material. 



3°. In the gutters at low tide the deposit is also 

 dirtier than at the Deposit buoy, and more 

 like the refuse from the Hoppers. 



4°. The material from the Hopper was very dark 

 coloured, and had much more yellow and black 

 amorphous decomposing stuff than is found on 

 the sea bottom at or near the Deposit buoy. 



5°. The shrimps caught about the Deposit buoy con- 

 tained in the stomachs — sand, vegetable tissue, 

 animal debris, legs, &c., of small Crustaceans, 



