120 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



Family MAGELONIDAE 



Genus MAGELONA Muller, 1858 



Magelona pacifica Monro, 1933 

 Monro, 1933, pp. 1048-1049, fig. 2. 

 Hartman, 1944, p. 320. 



A specimen questionably referred to this species comes from Santa 

 Catalina Basin. The prostomium has frontal horns. The first 8 thoracic 

 notopodia have a dorsal cirrus, located above a foliaceous notosetal 

 lamella; the corresponding ventral lamella is much smaller. In abdominal 

 segments the postsetal lobe is large, broad and lanceolate. 



The species has been taken more frequently from shallower benthos 

 of southern California; it is more typically a shelf and slope species. It 

 has a known geographic distribution that extends south to Panama, in 

 shallow depths. 



Magelona sp. 



Two specimens from Patton escarpment are unique for having a 

 rose-colored pigment forming a collar behind the prostomium and extend- 

 ing to the first setigerous parapodia. The prostomium lacks frontal horns. 

 Dorsal and ventral cirri are long, distally tapering through the first 8 

 segments, but surpassed by the setal tips. The modified setae of the ninth 

 segment are abruptly longer than others but similar in shape. 



Family CHAETOPTERIDAE 



Genus PHYLLOCHAETOPTERUS Grube, 1863 



Phyllochaetopterus prolifica Potts, 1914 

 Berkeley and Berkeley, 1952, pp. 63-64, figs. 131, 132. 



A fragment comes from Santa Catalina Basin. This is typically a 

 shallow water species, especially abundant on rocky or rubbly bottoms. 

 The tubes are typically long, cylindrical, more or less opaque, and irregu- 

 larly sinuous. It has a known geographic distribution extending from 

 western Canada to southern California. It is seldom in depths beyond 

 250 fms. 



Phyllochaetopterus limicolus, new species 

 (Plate 10, figs. 3-5) 

 Many collections are available; they come from muddy bottoms of 

 nearly all basins and the San Diego trough. The type was selected from 



