350 PROCEEDINGS OF THE ACADEMY OF [Juiie, 



to the axis of the supra-acicular lobe and serving as a postsetal support 

 to the setae. Notocirrophores (fig. 33) low and flat, moderate in size, 

 immediately above notopodium. Three or four only of the notostyles 

 remain. They are strongly foliaceous but rather small, scarcely or 

 not longer than the neurostyles and about one and one-half times as 

 wide as they, broad ovate or suborbicular with nearly straight, truncate, 

 scarcely excavated base, opaque brown with granules chiefly arranged 

 in radial lines. 



Aciculum single, pale 3^ellowish, ^\ith colorless base, straight, regu- 

 larly tapered to a simple point, which enters but does not project 

 beyond the acicular notch. Setae (PI. XVI, fig. 34) numerous (18 

 supra- and 27 subacicular on XXV), forming a broad, spreading, fan- 

 shaped fascicle, the shafts colorless, long, with about one-third of their 

 length projecting beyond the margin of the neurocirrus, slightly 

 curved, little enlarged at the end, where they terminate in a prominent 

 shoulder and a pair of high, tapered processes finely denticulated at 

 the ends which bound the socket. The only perfect appendage seen 

 has a length of about three-fifths the depth of the neuropodium and 

 is slender and finely denticulated. 



Proboscis (dissected) tubular with smooth non-papillated lining; 

 orifice surrounded by a circle of apparently eighteen soft papillae. 



This species has the smooth proboscis, prolonged neuropodia and 

 neuropodial cirri and form of setae characteristic of the subgenus 

 Sige, features which appear in the descriptions of no known Eulalia 

 from the North Pacific or the west coast of South America. 



Type from station 4,522, Monterey Bay, May 26, 149 fathoms, 

 gray sand and shells. 



Explanation of Plates XV and XVI. 



Plate XV. — Syllis heterochccfa — figs. 1-i. 

 Fig. 1. — Anterior end, X 56. 

 Fig. 2. — ^Parapodium XXV with one long and one short seta in ph\ce; 



a, short notocirrus from XXVI, X 56. 

 Fig. 3.— End of short seta from XXV, X 60tf. 



Fig. 4. — Same of long seta, X 250; a and b, articulation and tip of append- 

 age of same, X 600. 

 Pionosyllis typica — figs. 5-7. 



Fig. 5. — Parapodium with dorsalmost and ventralmost setae represented, 



X 24. 

 Fig. 6.— Tips of two acicula, X 400. 

 Fig. 7.— End of a seta from XXV, X 600. 

 OdontosyUis phosphorea — figs. 8-10. 



Fig. 8. — Parapodium X without seta^, 56. 



Fig. 9. — Parapodium L with bases of notopodial seta? onl}', X 56. 



Fig. 10. — Distal end of middle seta from L, X 600. 



