16 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



Exogone uniformis, new species. See below. 



Exogone verugera (Claparede) 1868. See below, in Key. 



Exogonella brunnea, new genus and species. See below. 



Haplosyllis spongicola (Grube) 1855, var. See Hartman, 1944c, p. 249. 



Central and southern California; littoral, in sponges. 

 Hespcralia nans Chamberlin, 1919. See below, under Autolytus spp. 

 Langerhansia heterochaeta (Moore) 1909. See Berkeley and Berkeley, 



1948, p. 76, as Syllis (Ehlersia). Western Canada to southern 



California ; common on shelf to slope depths, in mixed sediments. 

 Odontosyllis parva Berkeley, 1923. See Berkeley and Berkeley, 1948, 



p. 83. Western Canada to central California. 

 Odontosyllis phosphor ea Moore, 1909. See below. 

 Odontosyllis spp. See below. 

 Pionosyllis gigantea Moore, 1908. See Berkeley and Berkeley, 1948, p. 



83. Western Canada to California. 

 Pionosyllis typica Moore, 1909. Santa Cruz Island, California, dredged; 



rare. 

 Plakosyllis americana, new species. See below. 

 Sphaerosyllis hystrix Claparede, 1863. See Berkeley and Berkeley, 1948, 



p. 80. Western Canada to southern California ; Europe ; in shallow 



bottoms to intertidal. 

 Syllis elongata (Johnson) 1901. See Berkeley and Berkeley, 1948, p. 75. 



and Rioja, 1941, p. 688. Washington to California; western 



Mexico. 

 Syllis fasciata Malmgren, 1867. See Berkeley and Berkeley, 1948, p. 74. 



Central and southern California, north to western Canada; 



Europe ; cosmopolitan ; in littoral algal tufts, common. 

 Syllis gracilis Grube, 1840. See Fauvel, 1923, p. 259. Southern Cali- 

 fornia and western Mexico, intertidal. 

 Trypanosyllis adamanteus Treadwell, 1914. See Hartman, 1944c, p. 249. 



Central California ; in rocky intertidal areas. 

 Trypanosyllis gemmipara Johnson, 1901. See Hartman, 1944c, p. 249. 



Washington to southern California; in rocky habitats. 

 Trypanosyllis ingens Johnson, 1902. See Berkeley and Berkeley, 1952b, 



p. 488. Central California to western Canada. 

 Trypanosyllis intermedia Moore, 1909. Central and southern California, 



dredged. 

 Ty posy His aciculata Treadwell, 1945. See Reish, 1950, p. 1. Central 



California ; in rocky habitats. 



