324 PROCEEDINGS OF THE ACADEMY OF [June, 



end; cirrophores short but generally distinct. Those on II and V 

 are the longest, about one and one-half times the dorsal tentacular 

 cirrus and exceeding the greatest width of the body ; they have twenty- 

 four to twenty-seven joints; III and IV are slightly longer than the 

 dorsal of I and have nineteen to twenty-two segments. The remaining 

 notocirri are more or less regularly alternately longer and shorter even 

 to the caudal end, the longer in general equalling about three-fourths 

 the width of their segments and the shorter about three-fifths their 

 width. Those in the middle of the body have about sixteen or seven- 

 teen (fig. 2) and eleven to thirteen (fig. 2a) joints respectively. 



Acicula (PI. XV, fig. 2) of anterior parapodia in a row of six or seven, 

 the ends of which appear in a groove at the dorso-distal angle of the 

 neuropodia. They are pale yellow, rather stout, tapered and end in 

 blunt points, slightly knobbed and variously slightly bent or even 

 hooked; middle neuropodia have three or four and posterior only two. 



Setae in rough, irregular subacicular fascicles of about seven rows 

 of three or four each. They are colorless with rather long, curved 

 shafts slightly enlarged at the distal end (PI. XV, fig. 3) to form 

 simple, oblique articulations roughened by a few minute points. 

 Appendages of all except the setae of the dorsal row comparatively short 

 (fig. 3), two to four times the length of the oblique end of shaft, scarcely 

 curved and not hooked at the tip, which is a simple point below which 

 is sometimes an obscure accessory tooth; margin strongly toothed. 

 Setae of dorsal series and sometimes one or two of the next row more 

 slender (PI. XV, fig. 4) with very long, slender, straight appendages 

 usually about four times the longest of the lower rows, with blunt 

 ends (fig. 4&) and finer marginal denticulation (fig. 4a). Such setae 

 continue to the caudal end and are similar on all segments. Man}^ of 

 the posterior parapodia also bear a single stout, nearly straight, spine- 

 like simple seta, as long as the shafts of the others, in the dorsal part 

 of the bundle; it is probably to be regarded as a prolonged aciculum. 



Proboscis (PL XV, fig. 1) protruded about one-third of its length 

 beyond palps, broad cylindroid, diameter exceeding prostomium, 

 cuticle thick, smooth and entire at orifice; doreal tooth stout and blunt, 

 probably from wear; behind this is a circular fold bearing eight (or 

 nine?) distant, soft, rounded papillae. Gizzard reaches from IX to XXI 

 and has thirty-seven rings. Colorless in alcohol. 



The only specimen was taken at Station 4,423, off San Nicolas Island, 

 April 13, 339 fathoms, gray sand, black pebbles, shells. 



Syllis (Ehlersia) anops Ehlers, from the Straits of Magellan, is a 

 much more elongated species with the anterior and posterior doreal 



