1923] NATURAL SCIENCES OF PHILADELPHIA 229 



bate and smooth setae and ventral to them a single, stout, yellow, 

 blunt and internally fibrous spine (Plato XVIII, fig. 33). Beginning 

 with V, the setie remain as before but the spine is replaced by a 

 single scries of slightly curved, pale-colored crochets (Plate XVIII, 

 fig. 34), with a rather weak curved beak, a low crown of three or 

 four principal teeth and a secondary flanking series of fine ones on 

 each side ; guard of three or only two filaments on each half. They 

 gradually change in form as they increase in number and by VIII are 

 strongly curved, with a stout and nearly straight beak, a high crest 

 of six or seven teeth of diminishing size and the secondary teeth 

 nearly obsolete. As posterior segments are lacking and most of 

 the seta3 of anterior segments are broken, it is impossible to determine 

 if any serrate or spiral setae exist. 



The natural colors have faded, but the head and first three 

 segments are ashy, the rest light or dark brown and the glandular 

 zones whitish. One specimen has the anterior segments marked 

 with quadrate black spots. 



Portions of tubes are thick and firm, composed mostly of large 

 sand-grains of various colors, closely and securely fitted together 

 with little hard cement. 



Stations 4427, off Santa Cruz Island, 447-510 fathoms, black 

 mud; 4464, off Santa Cruz Lighthouse, 9-10 fathoms, rocky; 

 4556, off Point Pinos Lighthouse, 56-59 fathorns, rocks (type). 

 Heteroclymene glabra pp. nov. Plate XVIII, flgs. 35, 36. 



A species very imperfectly known through a single anterior end 

 consisting of the head and eight setigerous segments; measuring 

 22 mm. long and 1.2 mm. in diameter. 



Owing to the faintness of the furrow I/II the head and first 

 setigerous segment have a continuous tapering outline, of which 

 somite II contributes about four-sevenths of the length. Cephalic 

 plate inclined at an angle of less than 45°, the center deeply de- 

 pressed ])elow the limbus which exhil)its a sigmoid profile and 

 nearly circular outline. Lim])us with high, prominent, lateral 

 lobes, slightly auriculate anteriorly, the ])ost('rior lobe lower and 

 stiffer, with a deep median notch and slightly crenulated margin. 

 Carina low. flat, straight, about three-fourths length of cephalic 

 plate, contracted in the middle and slightly widened at both ends, 

 the anterior terminated by a small blunt-pointed palpode set in 

 a notch between the lateral lobes. Nuchal organs very narrow 

 slits almost as long as the carina and nearly straight with a very 

 slight lyriform curvature. Mouth prominent, crescentic, with 

 large furrowed lip. Prostomium with no marked characters. 



Somite II about one-third longer than head, tai^eretl to contracted 

 caudal end, smooth, with a faint anterior glandular zone and 

 neural groove; III is similar as is I\' also, except that it is only as 



