1909.] NATURAL SCIENCES OF PHILADELPHIA. 327 



A complete specimen with 230 much contracted segments is 60 mm. 

 long, with a maximum body width of 3.2 mm. at XXX. Prostomium 

 subquadrate, slightly wider than long; with a deep postero-median 

 dorsal incision and furrow. Palps completely separated to base, 

 slightly longer than prostomium, somewhat divided into basal and 

 terminal portions ; the former somewhat swollen and the latter slender 

 and abruptly bent ventrad. Median tentacle five or six times length 

 of prostomium and composed of fifty-six very short joints; lateral 

 tentacles about one-half as long, with thirty-five to thirty-eight joints. 

 Eyes on each side nearly or quite coalesced. Tentacular cirri arising 

 beneath prostomium, the dorsal nearly equal to median tentacle, 

 with fifty joints; the ventral slightly shorter than lateral tentacle, 

 with about thirty-five joints. Notocirrus of II the longest, about 

 one-third more than the median tentacle, with sixty-four to seventy 

 joints; that of III scarcely shorter and of IV two-thirds as long as II. 

 Following this the notocirrophores of odd-numbered segments are at a 

 slightly higher level and bear slender styles as long as the width of 

 their segments and with as many as sixty or seventy very short joints; 

 those of even-numbered segments have styles about two-thirds as 

 long. Pygidium a tapered ring bearing a pair of slender cirri as long 

 as its diameter and with twenty-five to thirty joints. 



A pharynx dissected had the circle of teeth in somite VIII; there 

 are eighteen to twenty slender compressed soft papillae and apparently 

 as many teeth, but the latter are so much broken that this cannot be 

 determined with certainty. Gizzard in XVIII to XXIX with thirty- 

 five distinct and seven or eight indistinct rings. 



The anterior thirty-five or forty segments are reddish-brown above 

 with pale intersegmental lines. 



One specimen each from stations 4,417, off Santa Barbara Island, 

 April 12, 29 fathoms, fine yellow sand, rock and coralline; and 4.420, 

 off San Nicolas Island, April 12, 291 fathoms, gray mud and rock. 



Odontosyllis phosphorea sp. nov. PI. XV, figs. 8-10. 



Epitokous, sexually mature examples, unfortunately much dis- 

 torted and broken. The type and largest specimen lacks some of the 

 caudal segments and measures 23 mm. long, 2.5 mm. in maximum 

 width between tips of parapodia and 1.5 mm. in width of body only. 

 The anterior region of twenty-three segments is 4.6 mm. long, the 

 middle of fifty-one segments provided with swimming notopodial setse 

 is 17 mm., and only four segments of the posterior region remain, mak- 

 ing seventy-eight segments in all. A smaller, more extended and 



