24 



are still unknown o 



Among the smaller crustaceans, which include about 

 150 species and abound in most of the shallower bottoms, 

 especially in the environs of outfalls or other polluted 

 areas, 907o of the amphipods, 80 to 90% of the cumaceans, 

 and 80 to 90% of the ostracods are considered to be 

 unknown (Personal curamunication, Dr, Jo Laurens Barnard). 

 These three crustacean, groups are not only highly differen- 

 tiated, but may have indicator valuCo 



The worm^like animals, including the polychaetes, 

 echiuroids, sipunculids, nemerteans, enteropneusts, 

 phoronids and solenogasters, are all well represented 

 in Santa Monica Bay, but are among the least known of 

 all invertebrateso The polychaetes (segmented worms) 

 are represented by no less than 350 species, most of which 

 are poorly or not known. They occur at all depths and 

 in moderate to great abundance, and are associated with 

 sediments and other animals in predictable numbers and 

 kindSo The echiuroids (spoon worms) are represented by 

 5 to 10 species, all either unknown or recorded through 

 only original descriptionso Sipunculids (peanut worms) 

 and nemerteans (ribbon worms) are conspicuous and easily 

 recognized when present, but their systematic categories 

 remain to be determinedo Enteropneusts (acorn worms) 

 of large size have been found to occur in significant 

 parts of Santa Monica Bay and at varying depthso According 

 to the authority of specialists, they have not been studied 



