100 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



single lobes, resembling dorsal cirri. Bifurcated branchiae are present 

 from the eleventh segment and this is the maximum number of filaments. 

 The posterior three-fifths of the body lacks branchiae. These specimens 

 resemble Nothria in this respect, but do not agree fully with species so 

 named below. 



Genus NOTHRIA Malmgren, 1867 



Nothria hiatidentata Moore, 1911 

 Moore, 191 1, pp. 259-262, figs. 41-50. 



The type locality is San Clemente Basin in 1059 fms. In general 

 appearance it resembles a species of HyaUnoccia (see above) but it has, 

 instead of lacks, peristomial cirri. It is known only through its original 

 account. 



Nothria pallida Moore, 1911 

 Moore, 191 1, pp. 256-259, figs. 24-28, 35-37. 



This species is commonly encountered in green muds in offshore areas 

 of southern California in depths less than subsill parts of basins (unpub- 

 lished records). It has been taken also in Santa Catalina, Tanner, East 

 Cortes and Long Basins. Individuals construct thick-walled tubes of 

 mud, resembling those of a terebellid, Pista disjuncta Moore, with which 

 it is often associated. The species may be expected to occur in most or 

 all of the middle and outer series of basins. It is not known outside of 

 southern California, in shallow to basin depths. 



Nothria iridescens (Johnson) 1901 

 Northia iridescens Johnson, 1901, p. 408, pi. 8, figs. 86, 87. 

 Hartman, 1944, pp. 87-88, pi. 5, figs. 99-104. 



This species was taken in Santa Catalina, West Cortes and Tanner 

 Basins. It is more frequent in shallower depths and has been more widely 

 reported from other parts of the northeast Pacific (Hartman, 1944, p. 

 88). This species is not clearly separable from Nothria elegans (Johnson) 

 (see Hartman, 1944, pp. 88-89) except for features concerning minute 

 details of anterior setae. N. iridescens is interpreted as occurring in 

 deeper bottoms with silty sediments, whereas N. elegans may dominate 

 shallower, silty sand bottoms. 



