5. Pholadldae . No Pholadldae vere recorded at either location. 

 A50 . Ok 'FovLJlDf^ Afients 



1. Silt . Deposits of silt, rangiiig from traces to light or 

 sometimes medium, occurred on all the panels, "both control and test, 

 at "both locations. 



2. Algae. Algae occurred as traces to light growths on 5 



of the ik control panels and on 6 of the 15 test pemels received from 

 location No. 1. At the second location, they were more prevalent, 

 occurring as traces to light or rarely moderate growths on 15 of the 

 16 control panels and 12 of the I6 test panels, one of the test panels 

 "being ^0^ covered. These growths were mostly green, although red and 

 "brown algae were also noted. 



5. InverteT>rate ftnlTnn,1 phyla . 



a. Coelenterata (hydrolds ). ^droids occurred on i|- of 

 the Ik control panels and on 7 of the 15 test panels received from 

 location Wo, 1. At the second location, they were more widely prevalent, 

 occurring on 9 of the I6 control panels and on 12 of the I6 test panels. 

 However, they were limited to traces and light growths. Tuhularia 

 was the only form identified. 



h. Bryozoa (encrusting and filamentous ). Traces of 

 encrusting Bryozoa occurred on 2 control panels and on only one test 

 panel at the first location. At the second location, they occurred 

 only on a single test panel. Traces of filamentous Bryozoa occurred 

 on only one each of the control and test panels at the first location, 

 and none were recorded at the second location. 



c. Annelida (annelid worms ). Serpulid worms occurred 

 more or less ahundantly on 8 of the 15 control panels and on 11 of the 

 test panels at the first location, seme of the latter "being from 25/^ 

 to 501^ covered. At the second location, they occurred only on k of 



the 16 test panels. Senaula and Spirorhia were present at "both locations. 



d. Mollusca (non"boring mollusks ). A single specimen or 

 Ostrea (oysters) was recorded on one of the test panels from the second 

 location. 



e. Chordata (txmicates ). A few colonies of Botryllus 

 schlosseri occurred on only a single panel of the control series at 

 the first location. 



259 



