Aij.i<-.05 Marine Borera - 



1. Teredlnldae . Teredlnldae , Including Bankla eetacea . Teredo 

 navalls , T. ( Lyrodus ) dlegenslB , T. ( Lyrodus ) sp., and X- sp., were very 

 active at this location.. They occurred in 56 of the k2 control panels, 

 ranging from minute pits to embryonic specimens, and in every calendar 

 month of the year, thus indicating that the "breeding season here is con- 

 tinuous. They occurred in every one of the k-9 test panels except the 

 fir^sjijand second of -ttie new i|--panel series, which was started on Nov- 

 ember l4> 19^6. Specimens were recorded up to 25P mm in length after 



8 months' submergence, 6ind panels in 19^5 were riddled after having been 

 submerged for only 5 to 6 months. The attack by Teredlnldae was so 

 destructive, that on this date the panels were removed and a new 4-panel 

 serifes was started. The attack rated very heavy each year. 



2. Limnoria . Limnorla showed some evidence of activity through- 

 out much of the period covered by the test but never occurred in more 

 than trace numbers. They occurred in only 8 of the k2 control panels, 

 and there were only from 1 to 5 timnels in each panel infested They 

 occurred in 27 of the k9 test panels, but there were never more than 



56 tunnels in any panel; and none occurred in 19^5 in the panels sub- 

 merged after March 15 . Thus, it can be seen that the Limnoria attack 

 never rated more than a trace. 



Akk.Qk Fouling Agents 



1. Silt . Silt occurred on all the panels, the deposits generally 

 rating from traces to light on the panels of the control series, and 



from traces to moderate, or sometimes heavy, on the panels of the test 

 series. In some cases the deposits were oily. 



2. Algae . A trace of a green alga occurred on only one control 

 panel . 



5. Invertebrate animal phyla . 



a. Co.elenterata (hydroid s ) . Hydroid's occurred on I8 of 

 the k2 control panels and on 50 of the k9 test panels, the growths 

 rating traces on the panels of the control eeries and ranging generally 

 from traces to light on the panels of the test series. Tubularla was 

 the only form identified. 



b. Bryozoa (encrusting and filamentous) . Encrusting Bryozoa 

 occuirred rather abundantly on the panels, being recorded on 2k of the 



k2 in the control series and on k6 of the kS in the test series. Three 

 of the test panels were from 50^ to 80^ covered after having been 

 submerged for 5 to 8 months. Cryptosula pallaslana occurred frequently, 

 and Cryptosula sp . , Crlsulipora occ Id entails . Holoporella brunnea . 



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