3. Invertebrate einlmal phyla . 



a. Porlfera (sponses ). Three colonies of a sponge occurred 

 on a single test panel. 



t. Coelenterata (hydroids ). Hydroids occurred as traces or 

 (rarely) light growths on 19 of the i)-0 control panels and on 26 of the h'J 

 test panels. Tuhularia was the only form "identified. 



c . Bryozoa (encrusting eind filamentous ) . Encrusting Bryozoa 

 occurred on k of the hO control panels and on IJ of the ^7 test panels. 

 Schizoporella unicornis , Schizoporella sp . , and Waters ipora cucullata 

 were identified. Filamentous Bryozoa occurred on 5 of the kO control 

 panels and on k of the ^7 test panels, one of the former being one-third 

 covered. Bugula f labellata , B. neritina , and B. sp. were identified. 



d. Annelida (marine worms ). Serpulid ( Serpula ) tubes occurred 

 more or less abundantly on 2^1- of the hO control panels and on h^ of the h"] 

 test panels. The raflYiTtnim length recorded on the test panels was h^ mm after 

 4 months' submergence. One of the control panels was 50^ covered. 



e. Arthropoda (crustaceaxis ). Balaxius (barnacles) occurred on 

 29 of the lj-0 control panels and on k6 of the ^7 test panels. The 

 xna.yJTnum diameters recorded were 8 mm on the control panels and 15 mm on 

 the test panels after k months' submergence. Two of the control panels 

 and U of the test pemels were from 50/^ to 100^ covered. 



f. Mollusca (nonboring mollusks ). I«Iiscellaneous nonboring 

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

 on 22 of the kO control panels and on 25 of the h'J test panels. They were 

 generally few in number, the most recorded on a single test panel being 



20 forms. The maximum diameter recorded was 10 ram on a control panel 



and 21 mm on a test panel after k months' submergence. ^f^jMiM (mussels) 



occurred on a single control panel and on 2 of the test panels, a 



nH,TlTnuTTi number of 55 being on any panel of either series. Ostrea (oysters), 



ranging from a few to Ik specimens, occurred on six of the test panels. 



Two specimens of Pecten (scallops) occurred on a single control panel. 



A solitary specimen of Pinctada (pearl oyster) occurred on a test panel. 



g. Chorda ta (tunicates ) . Tunicates occurred more or less 

 abundantly on 5 control panels and on 5 test panels. Botryllus 

 schloBseri occurred most frequently, and ascidians also were noted. 



A25 • 05 Summary and Conclusions 



1. Installation . A test board of the panel type installed 

 July 15^ 19^* at the U. S. Naval Operating Ba'se at G-uantanamo, Cuba, 

 to determine the identity and prevalence of marine borers and fouling 

 organisms, is still being operated. The results of this test have 

 been summarized to the end of 1947- 



110 



