NO. 2 HARTMAN, BARNARD: RENTHIC FAUNA OF DEEP BASINS 163 



by 5.5 mm wide; others, much smaller, are only 20 mm long by 1.6 mm 

 wide. The tentacular crown on smaller ones is longer than the thorax, 

 whereas in larger ones the comparative lengths are reversed. 



Thoracic notosetae are of 2 kinds; a longer superior limbate kind is 

 superior, and more numerous, broad, mucronated ones of variable length 

 are inferior. The accompanying neurosetae are long handled hooks. 



Potamethns mucronatus was first described from abyssal depths off 

 Santa Catalina Island, and off Santa Cruz Island in about 500 fms. 

 It has since been recorded from the northeast Pacific Ocean (Berkeley 

 and Berkeley, 1951, p. 333). It may be regarded as a deep water or 

 abyssal form. 



Genus MYXICOLA Koch in Renier, 1847 



Myxicola infundibulum (Renier) 1804 



Berkeley and Berkeley, 1952, p. 1 19, fig. 244. 



This was taken only once, in San Pedro Basin, but has been fre- 

 quently taken in shallower bottoms of southern California. The species 

 is regarded as cosmopolitan and eurybathic. 



Genus CHONE Kroyer, 1856 

 Chone spp. 



Small immature or vegetative individuals were taken in San Pedro 

 and Santa Catalina Basins. They may be representatives of one of the 

 shallower water forms. 



Family SERPULIDAE 



Members of this family are poorly represented in grab samples from 

 southern California. The best known are two species, one abundantly 

 represented by tubes in the long shore basins, and the other associated 

 with the dead remains of a lamp-shell brachiopod. 



Genus PROTIS Ehlers, 1887 



Protis pacifica Moore, 1923 



Hartman, 1955b, pp. 51-52, pi. 4. 



Tube fragments of this species are consistently present in samples 

 from San Pedro and Santa Monica Basins and occasionally in basins 



