408 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
23. Northia iridescens sp. hoy. PL 8, figs. 86, 87. PI. 9, 
figs. 88-92. 
o 
Form slender and nearly cylindrical, of almost uniform diameter 
in anterior region ; highly iridescent; branchiae curved over dor¬ 
sum, not reaching median line; slender, filiform, translucent (Fig. 
88 ). 
Prostomium (Figs. 86, 88) small, hemispherical; first or “acces¬ 
sory ” antennae elongate ovate, constricted at base; second pair of 
antennae two-jointed, basal joint slightly the longer, twelve-ringed; 
third pair of antennae three-jointed, with 11-13 annulations; this 
pair nearly four times as long as the second pair. Median cirrus a 
little shorter than third pair of antennae ; nine-ringed. Eyes want¬ 
ing. Palpi (Fig. 86) globose, pedunculate, spreading. 
Peristomium much broader than prostomium, with a pair of 
minute peristomial cirri (Fig. 88) projecting from its anterior bor¬ 
der. 
Jaws (Fig. 87) very similar to those of N. elegans , but with 
more teeth on the dental plates and more slender maxillae. 
Somites : four following the peristomium with modified parapodia 
(Fig. 88), similar to the same somites in JST. elegans ; the succeed¬ 
ing ones with filiform gills and dorsal cirri, but no ventral cirri (Fig. 
89). 
Hooded crotchets (Fig. 91) of ventral fascicles of first four 
somites very similar to those of preceding species.. Two stout, wing- 
tipped uncini (Fig. 90) in ventral fascicles of parapodia further 
back. Capillary setae with striated border (Fig. 92). 
Length of 52 somites, 38 mm. ; transverse diameter, 3 mm. 
This species is represented by a single specimen, dredged by Prof. 
W. A. Herdman at Victoria, B. C., in the summer of 1897, and by 
him kindly placed in my hands for description. Unfortunately, all 
the posterior portion of the specimen is lacking. The tube is of 
parchment-like material, opaque-white, flexible, and with adherent 
sand-grains. 
Lumbricoxereidae. 
24. Lumbriconereis zonata sp. nov. PI. 9, figs. 93-100. 
Form cylindrical, slightly tapered towards anterior end; para¬ 
podia placed a little below the mid-lateral line; somites three times 
as broad as long, each marked with a sharply-defined brown zone 
