5. Inverte'brate nnimal phyla . 



a. Porlfera (sponges ). A solitary sponge occurred on a 

 single test panel. 



"b. Coelenterata (bydroids ). Hydroids occurred as traces 

 or rarely light growths on 26 of the k2 control panels ~ and on 57 of 

 the h-S test panels. 



c. Bryozoa (encrusting and filamentous ). Encrusting Bryozoa 

 occurred on l8 of the k2 control panels and on J>0 of the 49 test 

 panels. Four control panels were from 50^ to 100^ covered, and 5 test 

 panels were from 50^ to 100^ covered. Cryptosula pallasiana , 

 Cryptosula sp., ELectra crustulenta , Gemelliporidra magniporosa , 

 Schizoporella unicornis , and Schizoporella sp. were identified. 

 Filamentous Bryozoa occurred on 12 of the k2 control panels and on 



l6 of the k9 test pemels. One paniel in "both the control and test 

 series was 50?& covered. Bxigula f labellata , B. neritina , and B. sp. 

 were identified. 



d. Annelida (annelid worms ) . Serpulid ( Serpula ) tuljes 

 occurred on 9 of the k2 control panels and on 2k of the k9 test panels. 

 Maximum lengths of 15 mm were recorded on the control panels and of 



k^ mm. on the test panels after 5 months' submergence. 



. e. Arthropoda (crustaceans ). Balanus ("barnacles) occurred 

 on 35 of the k2 control panels and on h"] of the 49 test panels. Mne 

 of the panels of the control series were from 25^ to 100^ covered, 

 and 25 of the test panels were from 20^ to 90^ covered. A Tnn.YlTmim 

 diameter of 15 Mn. was recorded on the control panels and of 29 mm 

 on a test panel after 5 months' submergence. 



f. Mollusca (nonboring mollusks ). Miscellaneous non"boring 

 mollusks occurred occasionally as follows: Anemia (jingle-shells) 

 occurred on 5 of the control paxiels and on 7 of the test panels; 

 the maximum numher recorded on any panel was 70. Maximum diameters 

 of 13 mm on a control panel and of UO mm on a test panel were recorded 

 after 8 months' submergence, t^ytilus (mussels) occurred on 5 control 

 panels and on 21 test panels; the maximum number recorded on aiiy one 

 of the test panels was 100 mussels. Maximum lengths of 8 mm on a control 

 panel and of 25 mm on a test paxiel were recorded after 5 months' 

 submergence. Ostrea (oysters) occurred on h control peuaels and on 26 

 test panels. Two- thirds of the face of one test panel submerged for 2 months 

 was encrusted, tfexlmum diameters of 32 mm on a control panel and of 78 

 mm on a test pajiel were recorded after 7 months' submergence. 



102 



