NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 151 



Myriowenia, new genus 



Genotype : Myriowenia californiensis, new species 



Setigerous segments number 29 or more. The first 3 setigerous seg- 

 ments are uniramous and others are biramous. The posterior end is taper- 

 ing and unadorned. Notopodial setae are simple, long, slender and dis- 

 tally pointed. Neuropodal setae are simple long shafted hooks ter- 

 minating in a large fang at right angles to the shaft. Myriowenia 

 differs from Myriochele (see above) in having a pair of long, thick palpi 

 emerging from the dorsal side of the prostomium (Plate 16, fig. 5). 



Myriowenia californiensis, new species 

 (Plate 16, figs. 5, 6) 

 Myriochele gracilis Hartman, 1955, pi. 2, fig. 5 only. 



No specimens are complete. One comes from San Pedro Basin and 

 most of the others are from shallower silty bottoms of southern Cali- 

 fornia. The type is selected from 2.8 miles west of Santa Catalina Island 

 in 58 fms (Sta. 2175), from a bottom of mud and shell. Many others 

 come from shallower to deeper bottoms off southern California in similar 

 sediments. There is no tube but in some instances a thin, mucoid cover- 

 ing is present. A larger fragment, perhaps more than half complete, 

 measures 22 mm long and 1.3 mm wide; it consists of at least 29 

 setigerous segments. The anterior cephalic region is inflated or subspheri- 

 cal, has a pair of dorsally inserted long palpi, set off from the first seg- 

 ment by a shallow to deep constriction (Plate 16, fig. 5). These palpi 

 are conspicuously speckled with light brown pigment on the upper or 

 outer side, in fresh collections. 



Uncini are present in neuropodia from the fourth segment and con- 

 tinue to the posterior end ; they occur in short transverse series, at first 

 ventrolaterally and from about segment 27 ventrally located, the paired 

 series of a segment separated medially by a short space. The correspond- 

 ing notopodia are located dorsolaterally. Seen separately, uncini are 

 sharply curved hooks terminating distally in a single tooth (Plate 16, 

 fig. 6). 



Myriowenia californiensis has been recovered from numerous samples, 

 chiefly in shelf and slope depths of southern California, and may be only 

 occasional in basin depths of inner basins. 



