JOHNSON: POLYCHAETA OF PUGET SOUND REGION. 431 
somite, there passing on the left side to mid-ventral line, and thence 
to oral notch. Setigerous tubercles small. 
Capillary setae (Fig. 189) of thorax single or double-bordered ; 
uncinigerous tori (Fig. 186) short, small; uncini avicular, with very 
long manubria, uniserial, or incompletely biserial (Fig. 190); setae 
of the abdomen very similar to those of thorax; uncini of abdomen 
(Figs. 191, 192) with much elongated rostra. 
Length , 87 mm.; transverse diameter of collar, 5 mm.; greatest 
transverse diameter of abdomen, 4.5 mm. 
This species is represented by a single specimen, collected by Miss 
Robertson at Port Orchard, on July 4, 1898. The specimen was 
preserved in formalin and the color when first received (no doubt 
nearly that of the living worm) was a bright orange. The worm is 
undoubtedly a tube-dweller, but there are no data concerning a tube 
or the precise habitat. 
As suggested to me by Professor Merrill, the branchiae of this 
specimen are in all probability in process of regeneration. 
Eriographidae. 
49. Myxicola pacifica sp. nov. PI. 19, figs. 193-198. 
Body fusiform, terete; tapered slightly towards anterior, much 
more, and gradually, towards posterior extremity; somites 67-97 in 
number, short, biannulate; no collarette; two fleshy processes 
(tentacles?) on first somite, adjacent to mouth; thorax hardly dis¬ 
tinguishable from abdomen and composed of nine somites. 
Branchiae (Fig. 193) 14 on each side, connected by a web (to.) 
as far as radioles extend, i. e., within 3 mm. of tip; radioles slender, 
biserial; tips of branchiae spirally coiled in retraction. 
Thoracic setae of two forms: (1) double-bordered capillary 
(Fig. 194), very slender, often twisted ; and (2) blunt, spinous 
setae (Fig. 195) with conical tips, much fewer in number; both 
kinds occur together in tufted fascicles. Uncini of thorax with 
long manubria (Fig. 197), strong rostra, and minute teeth ; uniserial. 
Abdominal setae (Fig. 195) slender, minute, very broadly double- 
bordered ; abdominal uncini (Fig. 198) very minute, avicular, 2-3 
teeth above rostrum; arranged in tori which nearly encircle the 
body, being interrupted only by the setigerous papillae and a 
median stripe on dorsum; uniserial. 
