96 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



slender capillary setae. The distal end of the hooks is unique in that it 

 appears simply falcate (PL 13, fig. 7) surmounted by a rounded hood. 

 Under high magnification a small secondary tooth is visible (PL 13, 

 fig. 6) in some hooks. 



The body terminates in a constricted pygidial ring (PL 13, fig. 2), 

 followed by a semicircular disk with a pair of dark spots at the sides. 

 Pouched glands are present in neuropodia from about the tenth to 

 seventeenth segments. 



The tube is U-shaped, loosely constructed and externally covered with 

 silt and muddy debris ; internally it is smooth and mucoid. Tubes tend 

 to be massed to form clumps, with the anterior open ends in the same 

 direction. 



Boccardia basilaria differs from other species of the genus most con- 

 spicuously by having hooded hooks that are nearly falcate. The modi- 

 fied spines of the fifth segment are of two kinds; one is falcate, the 

 other is bristle-topped with a constricted neck region below the orna- 

 mented region. In this respect it approaches B. proboscidea Hartman, 

 inhabiting intertidal zones of California. From the latter, B. basilaria 

 is distinguished by its altogether different kind of hooded hooks and 

 pygidial processes. 



B. basilaria has been found most concentrated in shallow shelf 

 bottoms of the Santa Barbara shelf south to San Pedro area, in depths 

 to 40 fms, in silts and black fine sands, associated with many other 

 kinds of polychaetes. Its known distribution is limited to southern Cali- 

 fornia, in shallow ocean bottoms. 



Genus Polydora Bosc, 1802 



Type P. cornuta Bosc, 1802 



Polydora neocardalia, new species 



Plate 14, figs. 1-4 



Collections. The type is selected from VELERO IV Sta. 2217; 

 others come from Stations 2307, 5502, 5832. 



This is a small species; length is 15 to 24 mm, and width 1.5 mm; 

 segments number about 100. The prostomium is broadly bifid at its 

 frontal margin ; eyes are weakly developed to absent and number 2 to 

 4 spots, with a pair on either side between the palpal bases. The nuchal 

 ridge is long and extends back through the fifth to ninth setigerous 

 segments. The paired palpi are long and extend forward for a distance 



