JOHNSON : POLYCHAETA OF PUGET SOUND REGION. 409 
which extends around the trunk, widening on each side, above and 
below, as it approaches the parapodium. Middle of each band 
marked by a sharp dark line (Figs. 93, 95, 96). 
Prostomium (Fig. 93) acorn-shaped, of a lighter tint than the 
trunk ; perfectly smooth and glistening. 
Peristomium (Fig. 93) tapered to the diameter of the base of the 
prostomium which is less than three fourths the diameter of the 
third somite. Second somite about one half the aAmrage length of 
the somites. 
Jems as shown in Fig. 94. 
Parapodia (Figs. 97, 98) less than one half diameter of body, 
bi-lobed at tip, posterior lobe the longer. Setae inserted between 
the lobes. Setae, as usual, of two forms : winged capillary (Fig. 
99) in anterior portion of body and ‘‘hooded crochets” (Fig. 100) 
in the posterior portion. 
Length of *200 somites, 167 mm.; diameter, including parapodia, 
4.5 mm.; without parapodia, 3 mm. 
A single imperfect specimen lacking the posterior region, was col¬ 
lected by Professor Ritter at Salmon Bay, Puget Sound, May 29, 
1899. This specimen is remarkable for the possession of abnormal 
segmentation in as many as live places. In two instances the so¬ 
mites are spiral in the way shown in Figs. 95, 96, representing re¬ 
spectively the dorsal and ventral sides. In another place, the spiral 
extends through nine somites, Avith a forked somite at each extremity. 
The other two instances are partially-divided somites Avithout a spiral 
arrangement — in one case with the parapodium displaced towards 
the ventral side. The asymmetrical somites are not confined to 
anv limited region, but are scattered for a long distance through the 
middle region of the body. 
Glyceridae. 
25. Glycera rugosa sp. nov. PI. 10, figs. 101, 102. 
Form stout, terete, thickest about one third the distance from 
head to posterior extremity, tapering slightly cephalad; much more, 
though gradually, caudad. Number of somites 200-300, distinctly 
two-ringed, all setigerous except the pygidium. The rings are 
nearly equal, but the anterior one, Avhicli bears the parapodia, is often 
raised like a Avelt, giving the body a corrugated aspect. 
