48 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



Hesperono'e laevis differs from other species of the genus as indicated 

 in the key above. H. complanata is commensal with a ghost shrimp in 

 intertidal zones; H. adventor is commensal with an echiuroid, in inter- 

 tidal zones; both are reported from the northeastern Pacific Ocean, 

 from western Canada to southern California. H. laevis has been re- 

 covered only from areas in which an echiuroid, Listriolobus pelodes 

 Fisher, occurs; this echiuroid is most abundant in 20 to 40 meters depth 

 off the Santa Barbara shelf. Grab samples taken from these bottoms have 

 consistently yielded other polychaetes {Ceratocephala crosslandi ameri- 

 cana Hartman, Marphysa disjuncta n.sp., Poecilochaetus johnsoni Hart- 

 man, Prionospio pinnata Ehlers, Terebellides stroemi Sars, 32 species 

 of polychaetes in all) together with a large red nemertean, a seawhip, a 

 phoronid, and small pelecypod mollusks (see Barnard and Hartman, 

 1959, pp. 6-11). 



Genus Harmothoe Kinberg, 1855 



At least 7 species are represented in southern California ; one is newly 

 named. 



Key to Species of Harmothoe 



1. Without prostomial eyes; in deep soft bottoms of southern Cali- 

 fornia H. tenebricosa 



1. With prostomial eyes 2 



2. Eyes located at frontal margin of prostomial peaks 3 



2. Eyes located behind prostomial peaks 4 



3. Parapodia laterally prolonged; dorsum marked with bars of 

 pigment; in shallow soft bottoms of southern California . 



H. priops 



3. Parapodia not prolonged; dorsum speckled; in intertidal areas 

 of northern and central California . . . . H. imbricata 



4. Elytra with marginal fringe and coarsely areolated ; in rocky 

 habitats of California H. hirsuta 



4. Elytra without marginal fringe and not areolated .... 5 



5. Distal end of neuropodial falcigers deeply incised, with the 

 accessory tooth long and slender; in soft bottoms, perhaps com- 

 mensal . H. lunulata 



5. Distal end of neuropodial falcigers excavate, with accessory 

 tooth short ; in green silts H. scriptoria 



5. Distal end of neuropodial falcigers with short accessory tooth 

 and the tip of the tooth not extending distally as far as main 



