404 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Prostomium (Fig. 67) about one and one half times as broad as 
long, in front obtuse, convex, the base nearly full width of peristo- 
mium. Palpi fused for nearly half their length. Antennae and 
median cirrus moniliform, similar to peristomial and dorsal cirri. 
Eyes four, the anterior pair twice the size of the posterior, and con¬ 
siderably further apart. 
Peristomium with dorsal and ventral cirri, without parapodia or 
setae. 
Parapodia (Figs. 67, 69) uniramous, with double aciculae; setae 
few; ventral cirri short, plain; dorsal cirri moniliform, gradually 
tapered from the base; slightly exceeding in length the diameter of 
the worm. Articulations 10-15 in antennae and peristomial cirri, 
increase to 16-18 (in some specimens, 18-20) in dorsal cirri of the 
anterior region, then diminish to 14-15 in more posterior somites. 
Pygidium (Fig. 68) hemispherical ; anus on its dorsal side ; anal 
cirri longer than the dorsal cirri, cylindrical, 16-17 jointed. 
Alimentary canal (Fig. 71) of usual form ; proboscis with a 
circlet of thirteen conical papillae {pap.) at its orifice, and armed 
with a single tooth ( t .) near anterior edge of chitinized lining; pro¬ 
boscis frequently found everted in preserved specimens. Oesopha¬ 
gus ( oes .) elongated, extending through about twelve somites ; its 
posterior third thick-walled and glandular. The proventriculus or 
“gizzard” ( prov .) of the usual structure, extending through eight 
to ten somites, according to degree of contraction of body; cylin¬ 
drical, rounded at the ends, lumen very narrow. Ventricular coeca 
(c.) much elongated, extending through four somites, frequently 
curved or bent double and opening into digestive tube just back of 
the proventriculus. 
iSexes distinct; no stolonization ; genital products develop only 
in posterior somites (163d to 194th in a female specimen with 198 
somites), which become much enlarged in consequence. 
Color , in life, nearly white, translucent ; ova rich yellow. 
Length of full-grown female (198 somites) 58.5 mm. ; transverse 
diameter, including parapodia, 1.1 mm. 
A single specimen was collected by Miss Robertson at Port 
Orchard in July, 1899. It is immature, measures 31 mm. in length, 
and has but 146 somites. 
This species occurs within tide-marks as far south as Pacific 
Grove, Cal., where I have taken sexually mature specimens in De¬ 
cember. I have also collected, in the month of February, sexually 
