JOHNSON: POLYCHAETA OF PUGET SOUND EEGION. 407 
length of the basal joints; third pair three-jointed, the middle joint 
much the shortest, and the distal twice as long as the proximal; 
this pair more than twice as long as the second pair, and reaching 
the sixth somite. Basal joints of second and third pairs of antennae 
with nine or ten obscure annulations. Median cirrus likewise three- 
jointed, one half as long as third pair of antennae, and with long 
terminal stylode ; its basal joint five-annulate. Palpi large, globose, 
approximate (Fig. 7S,p.). Eyes four, small, at bases of third pair of 
antennae, one pair directed forward, the other laterally (Fig. 78). 
Peristomium (Fig. 77, 78) shorter and narrower than the other 
somites, having on its antero-dorsal border a pair of small, slender, 
peristomial cirri (Fig. 78,/). c .). 
Somites : first four or five back of peristomium longer and nar¬ 
rower than the succeeding ones, with parapodia (Figs. 77, 80) of 
different form from the rest, characterized by an elongated ventral 
ramus, with acute achaetous terminal portion, a large fusiform 
ventral cirrus (y. c:), a dorsal cirrus (d. c.) of similar form and 
dimensions, and a cirriform gill (br.), likewise of similar aspect. 
The transition to the typical somite and foot is gradual (cf. Fig. 
81, 28th foot). 
Branchiae unbranched throughout, tapered to an acute tip, 
increasing in length caudad, until they exceed half the transverse 
diameter of the trunk. The setae of the 4-5 anterior parapodia are 
different from those of the succeeding feet, and are of two forms, 
“hooded crotchets” and capillary bristles (Figs. 82, 88). Setae 
of dorsal rami throughout the series are buried in the foot; at 
most, their tips protrude (Fig. 85). Setae of ventral rami be\ T ond 
fifth foot are (1) bordered capillary (Fig. 84), (2) a pair of stout, 
two-pronged uncini with flabellar expansions at tip — in all respects 
like uncini of succeeding species (Fig. 90). 
Tipper jaws (Fig. 79) asymmetrical, six pieces on right, seven on 
the left. 
J^ength of 85 somites, 66 mm.; transverse diameter, 6 mm. 
The antero-dorsal portion of the trunk elegantly marked with 
paired umber-brown spots placed near the posterior border of each 
somite; these tend to coalesce across the median line (Fig. 77). 
Three or four specimens of this fine Northia occur in the Colum¬ 
bia University collection. Unfortunately, all lack the posterior 
portion of the trunk. There are no data as to depth or exact local¬ 
ity. The tubes also are lacking. 
