NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 145 



right-angled, with short limbs. The buccal segment is not clearly set off 

 from the first setigerous segment. 



Notopodial setae are present from the first setigerous segment and 

 are of two kinds — longer, larger, stiff, smooth ones, and an equal number 

 of smaller, shorter ones; they terminate in an arista or fimbriated tip. 

 Bearded uncini are few in number, at most 6 in a single transverse row. 

 They are first present in the fourth segment, where they number about 

 4 in a transverse row, and continue posteriorly through the last, or 19th, 

 setigerous segment. 



The fourth, or collar segment, varies from longer to shorter, but is 

 usually nearly as long as the preceding segment. The collar is low on the 

 dorsal side and increases midventrally to its longest point ; it is deepest 

 above. Its origin is in front of the uncinigerous ridge. In a specimen from 

 Tanner Basin the collar is straight, not oblique. 



Tubes are thick walled, of gray mud or somewhat arenaceous ; they 

 are straight and terminate in a narrow, translucent chimney and are 

 externally lightly covered with small foraminifers. 



Leiochone borealis, sensu Moore, 1923, p. 227, from off Point Loma 

 light, in 549-585 fms, in green mud, may be the same species. Another 

 species resembling it is Lumbriclymene constricta Wesenberg-Lund 

 (1948, pp. 12-15, fig. 4) from Davis Strait, Greenland, in 1096-2258 

 meters. It also has a collar on the fourth segment, prolonged at its ventral 

 end. There are thick, acicular spines in 3 (not 4 segments as in Lumbri- 

 clymene) segments and the posterior end has 5 preanal asetigerous seg- 

 ments. If it is the same as Clymenopsis cingulata, the geographic distri- 

 bution is extensive, including the West Indies, Greenland and southern 

 California, in deep water. 



Genus PRAXILLELLA Verrill, 1881 



Praxillella gracilis (Sars) 1861 

 Moore, 1923, p. 238. 



Berkeley and Berkeley, 1952, p. 50, figs. 101, 102. 



Small, immature or vegetative individuals come from Santa Catalina 

 and West Cortes Basins. Larger, reproductive specimens are frequent 

 from shelf and slope depths of southern California. The species is 

 recorded from cosmopolitan areas, in 48 to 766 fms. 



