8 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



Evarnella fragilis (Moore) 1910. Southern California, in depths to 600 

 fms; perhaps on rocks. It approaches Evarnella impar (Johnston) 

 from northern Europe. 



Halosydna brevisetosa Kinberg, 1855. See Hartman, 1939, p. 34, and 

 Berkeley and Berkeley, 1948, p. 18. Alaska to central California, 

 rare in southern California; intertidal in Mytilus zone; free- 

 living or in tubes of terebellids and Platynereis bicanaliculata. 



Halosydna johnsoni (Darboux) 1899. See Hartman, 1939, p. 34. 

 Southern California and western Mexico ; intertidal ; in Mytilus 

 zone, or commensal with terebellids. 



Halosydna latior Chamberlin, 1919. See Hartman, 1938b, p. 110. 

 Southern California and western Mexico ; perhaps commensal. 



Halosydna tuberculifer Chamberlin, 1919. Southern California at La- 

 guna Beach ; intertidal under stones. 



Harmotho'e crassicirrata Johnson, 1897. Monterey and southern Cali- 

 fornia, to 100 fms; in rocky habitats. 



Harmotho'e hirsuta Johnson, 1897. See Hartman, 1939, p. 51. Alaska to 

 southern California ; intertidal to shallow rocky depths. 



Harmotho'e imbricata (Linnaeus) 1767. See Berkeley and Berkeley, 

 1948, p. 11. Northern California northward to Alaska, rare off 

 southern California ; cosmopolitan ; usually intertidal. 



Harmotho'e lunulata (delle Chiaje) 1841. See below. See Hartman, 

 1944c, p. 244. Southern California to western Canada; southern 

 Europe ; very common in shallow depths in silty bottoms ; probably 

 commensal. 



Harmotho'e priops, new species. See below. 



Harmotho'e scriptoria Moore, 1910. See below. Nearly related to Har- 

 motho'e lunulata, differing only in details of neuropodial setae. 

 Southern California, in 50 fms or deeper ; on silty bottoms. 



Harmotho'e tenebricosa Moore, 1910. Southern California and western 

 Mexico, abyssal depths, silt. 



Hesperonoe adventor (Skogsberg) 1928. See below, in Key. California 

 north to Alaska ; intertidal ; commensal with echiuroid, Urechis 

 caupo Fisher. 



Hesperonoe complanata (Johnson) 1901. See Berkeley and Berkeley, 

 1948, p. 10. Western Canada to southern California; intertidal; 

 commensal with ghost shrimp, Callianassa calif orniensis Dana. 



Hesperonoe laevis, new species. See below. 



Intoshella caeca (Moore) 1910. See Hartman, 1938b, p. 121 ; Hartman, 

 1959b, p. 67 (as Eunoe caeca). Southern California, in deep 

 water; probably commensal with a holothurian. 



