32 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



Cossura pygodactylata Jones, 1956. See below, in Key. San Francisco 

 Bay and north of Channel Islands, southern California, in shelf 

 depths, in silty sediments. 



Dodecaceria concharum Oersted, 1843. See below, in Key. See Berkeley 

 and Berkeley, 1952a, p. 34. Western Europe; western Canada to 

 southern California, penetrating calcareous structures in littoral 

 zones. 



Dodecaceria fewkesi Berkeley and Berkeley, 1954. See Plate 20. North- 

 eastern Pacific Ocean, in intertidal, rocky habitats. 



Raricirrus maculata, new genus, new species. See below. 



Tharyx monilaris Hartman, 1960a, p. 127. See below. Southern Cali- 

 fornia, in shelf to basin sediments, silt. 



Tharyx multifilis Moore, 1909. See below. See Berkeley and Berkeley, 

 1952a, p. 34. Southern California, intertidal to shelf depths. 



Tharyx parvus Berkeley, 1929. See below. See Berkeley and Berkeley, 

 1952a, p. 35, as T. multifilis parvus. Northeastern Pacific, inter- 

 tidal, silts. 



Tharyx tcsselata Hartman, 1960a, p. 126. See below. Southern Cali- 

 fornia, in shelf to basin depths, silt. 



Timarete perbranchiata (Chamberlin) 1918. Pacific Grove and southern 

 California ; in rocky habitats. 



Family Ctenodrilidae 



Ctenodrilus serratus (Schmidt) 1857. See Hartman, 1944c, p. 323; 

 Berkeley and Berkeley, 1952a, p. 37. Central and southern Cali- 

 fornia, contaminant in aquaria, cosmopolitan. 



Family Flabelligeridae 



Brada glabra Hartman, 1960a, p. 129. Southern California, in slope and 

 basin depths, silt. 



Brada pilosa Moore, 1906. Alaska south to southern California. 



Brada pluribranchiata (Moore) 1923. Southern California, in sandy 

 silts. 



Flabelligera commensalis Moore, 1909. See below. 



Flabelligera essenbergae, new name. See below. 



Flabelligera inj undibularis Johnson, 1901. See Berkeley and Berkeley, 

 1952a, p. 7. Western Canada and Alaska south to southern Cali- 

 fornia. 



