NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 121 



sill depth between San Pedro and Santa Monica Basins in about 450 fm 

 depth, in sediments of fine green mud. 



Tubes are long, cylindrical, translucent, unbranched, and limp to 

 somewhat stiff. When empty they resemble pale, yellowish-green algal 

 strands or soaked straws. They are not annulated or only vaguely so and 

 measure 250 mm or more long. The enclosed animals are much shorter, 

 about 20 mm long and 2 to 3.5 mm wide. Most specimens are recovered 

 in fragmented pieces, the breaks occurring usually behind the thoracic 

 and in abdominal segments. 



The body consists of 3 regions, a short anterior one with 9 setigerous 

 segments, a median one with only 2 segments, and a posterior one with 

 many segments. These regions are best marked by the character of the 

 parapodia. In the anterior region they have conspicuous notopodiai lobes 

 with setae in vertical projecting series. The fourth notopodium has a 

 single heavy dark spine in either side. Notopodia of the middle region 

 are frilled, deeply bilobed and extend across the middorsum as a delicate 

 transverse fold. The posterior or third body region has inconspicuous 

 parapodial lobes (Plate 10, fig. 3). Notopodia are slender, cylindrical, 

 and neuropodia are low, divided transverse ridges. 



The dorsum of the anterior region is flat and broader than the rest 

 of the body. The large peristomium extends well forward and obscures 

 the much smaller prostomium, which is visible as a small, blunt lobe 

 between the palpal bases; it lacks eyes. The long, paired grooved palpi 

 are inserted at the sides of the transverse oral slit, and within the bases 

 of the first pair of notopodia. Immediately behind and at the sides are 

 small, cylindrical paired antennae; they are shorter than the prostomium 

 is wide. 



On the ventral side of the body the peristomial ring and the first 

 2 setigerous segments are chalky white or pale. A dark tawny or brown 

 band extends across the third to fifth segments; this is followed by a 

 chalky white patch extending from between segments 6 to 8 ; thereafter 

 the body is greenish or dark grayish green. 



The parapodia of the first 4 segments are directed laterally; there- 

 after they are slenderer and directed dorsally. The first pair are smaller 

 than others of the thorax; there is a gradual increase in size through 9 

 anterior segments. Each notopodium has a transverse fascicle of limbate 

 setae in which the uppermost are slenderest and the inferiormost are 

 shortest and broadest; they terminate in pointed tips. In addition, the 



