POLYCHAETES 



103 



which occurs also on Guam and Australian reefs (Bailey- 

 Brock, personal observation), Tiiposiillis prolifera, 

 Ceratonereis tentaculata (C. mirabihs). Li/sidice ninetta 

 (L. collahs). and Mesochaetopterus Sagittarius (M- minutus). 

 These syllids and nereidids are typically associated with 

 algal turf and encrusting sponges. Lvsidice ninetta and 

 P. siciliensis are known to bore in coral, and the tube 

 builder, M. Sagittarius, forms dense aggregations in sand 

 patches on intertidal reefs and benches. Many species, 

 presently only identified to genus, may eventually further 

 relate the Enewetak polychaete fauna to that occurring on 

 other coral islands in the Pacific. 



Little is known about the interstitial annelids at 

 Enewetak. However, nearly 50% of the meiobenthic fauna 

 from sands around the atoll was found to be composed of 

 polychaetes by MacCoy (1967). Further research is neces- 

 sary to define this fauna systematically. 



MYZOSTOMATIDA 



At least two, as yet undetermined, myzostomatid 

 species have been found on comatulid crinoids collected at 

 Enewetak (Devaney, personal observation). 



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