POLY CHA5TOUS ANNELIDS OF THE HAWAIIAN ISLANDS. 
1167 
Mandibles dark brown, with lighter colored edges. Each half of nearly uniform diameter through- 
out, curving gently outward at anterior end. Maxillae stout, gently curved; left dental plate with 
8 teeth; left paired with about 12, left unpaired with 8; right dental with 9, right paired with about 12. 
Color pale, with only toothed edges darker. 
Gills begin on second parapodium, there rather small, with axis and 3 lateral branches; on third 
parapodium gill much larger, reaching mid-dorsal line, and with 12 branches; from fourth setigerous 
somite (sixth body somite) gills overlap in mid-dorsal line, this overlapping continuing until about the 
twenty-fifth somite, where gills begin to shorten until, on about somite 45, each has only 3 branches. 
On somite 50 gill is composed of only a small cirrus-like outgrowth from the dorsal cirrus. In its 
greatest development, the gill may have as many as 30 branches. (See fig. 43, of eleventh parapodium. 
Note the bend in the axis of the gill, which brings its terminal portion to lie parallel to the dorsal 
surface Of the body. ) Setigerous lobe with a rounded posterior, and a longer, nearly rectangular, 
anterior lobe. Into the latter extend the large aciculae. Dorsal setae long, gently curved, tapering 
gradually to a sharp point. At the point where curving begins, they are somewhat broader than 
elsewhere, with minute denticulations along the concave edge. Ventral setae compound; basal portion 
long, expanded slightly at end, terminal portion narrow, sharp pointed at apex, with a terminal and a 
subterminal tooth (fig. 44). On posterior parapodia the teeth on the compound setae are more 
prominent, and there are minute denticulations on 
both proximal and distal joints. 
Type (no. 5210, U. S. National Museum) an incom- 
plete specimen, retaining only the anterior 125 somites; 
length of this, 115 mm.; peristomium 4 mm. wide; 
body diameter increases gradually to about 50 mm. 
behind head, where it is 7 mm.; body (in formalin) a 
pale flesh color; gills white. Collected at station 4134, 
on bottom of fine coral and volcanic sand, at depth of 
324-225 fathoms. 
A second much smaller specimen, not more than 
one-quarter the size of the above, and with gills begin- 
ning on the fourth somite, was collected at station 
4021, 286-399 fathoms, on a bottom of coral sand and 
foraminifera. 
Fig. 45. Fig. 46. 
Eunice interrupta, new species. 
Eunice interrupta , new species. (45) Twelfth parapo- 
dium, x 45; hr., gills. (46) Ventral seta, x 280. 
Prostomium broader than long, with a well 
marked, though shallow, depression on the anterior 
border. Peristomium longer ventrally than dorsally, the median tentacle seeming to lie in a slight 
depression on its anterior edge. All tentacles moniliform, the constrictions being a little less distinct 
at the base than at the tip. Median tentacle extending to posterior border of ninth somite, inner 
laterals to somite 8, outer laterals to somite 3. Eyes large, brown, situated lateral to base of inner 
lateral tentacles and posterior to base of outer laterals. 
Second somite one-third length of peristomium, its articulated cirri reaching to anterior border of 
eye. Dorsal cirrus of anterior parapodia noticeably moniliform, resembling the tentacles in this 
respect, becoming less noticeable, however, in succeeding somites, as in figure 45 of the twelfth parapo- 
dium, where dorsal cirrus shows merely a jointing. This jointing disappears at the twenty-second 
somite. 
Gills first appear as a 1-branched appendage to the fifth parapodium; on the seventh they are 
2-branched; on the eighth they are 3-branched, on the fifteenth they become- 2-branched again; on 
the twenty-first there is but one. There is some variation in this gill arrangement, some somites in 
the middle of the body apparently lacking them. In the type a very small single branch is found in 
all somites, posterior to second. 
Ventral cirri short and stout anteriorly, longer and narrower posteriorly. Two long, faintly artic- 
ulated dorsal anal cirri. Ventral anal cirri, if originally present, had been lost. 
Dorsal setse long, simple, sharp-pointed at apex. Ventral setse compound, basal portion with broad 
end, a single large tooth at the apex, and a row of fine denticulations down the side (fig. 46) . Terminal 
F. C. B. 1903, Pt. 3—26 
