Annelids of Alaska—H artman 
33 
They are bounded behind by a low fleshy ridge, 
from which a long, slender lobe arises at about 
the mid-length of the ridge (Fig. 8 e). 
Abdominal notopodia have a long, simple, 
postsetal lobe. Neuropodia have a longer, pre- 
setal process and a shorter, postsetal (or slightly 
ventral) one (Fig. 8 d). There are no ventral 
cirri but a short flange (or ridge) is present at 
the lower end of neuropodia. Intercirri, podal 
and subpodal lobes are lacking. 
This specimen differs from other species of 
the genus most noticeably in the slenderness of 
its thoracic postsetal lobes, and abdominal noto- 
setal process, also the bilobed neuropodial 
process (Fig. 8 d). 
This represents the first record of a Haplo- 
scoloplos from Greenland. 
Family PARAONIDAE 
Genus Aricidea Webster 
Aricidea heteroseta new species 
Fig. 9 a-d. 
Collection. Lazy Bay (2). 
A slender, threadlike though much-coiled in¬ 
dividual measures not over 25 mm. long and 
about 1 mm. wide; it consists of 110 segments 
(posteriorly incomplete). The prostomium is 
flat, depressed, trapezoidal in shape and about 
as long as wide; the greatest width is behind 
the insertion of the median antenna. At its an¬ 
terior end it is broadly rounded but when seen 
from the ventral side it appears slightly incised 
medially. The dorsal surface is plain except for 
the attachment of antennae, and the slightly 
crescentic nuchal slits near the posterior portion 
(Fig. 9 a). The median antenna is smooth and 
tapering; it extends back to the middle of the 
first segment. 
Branchiae are present from the fourth to 
thirty-fourth setigerous segment; they number 
30 pairs. They are abruptly absent thereafter. 
The first are already large but they increase in 
size gradually so that the two of a pair overlap 
medially. They are broad and straplike; they 
taper to a point distally and are fimbriated at 
their lateral margins but the tip is smooth (Fig. 
9 b). 
Parapodia have a prolonged, postsetal, noto- 
podial lobe; this is small at first but increases in 
size through the anterior branchial region and 
diminishes thereafter. In the anterior branchial 
region it is broad, auricular, and has the propor¬ 
tions shown in Figure 9 b; it gradually dim¬ 
inishes in width in the posterior branchial 
segments so that it comes to be slender, cirri- 
form, and is continued so to the end of the 
pieces. Setal lobes are most conspicuous in the 
Fig. 9. Aricidea heteroseta new species: a, anterior 
end in dorsal view, X 34; b, ninth parapodium in 
anterior view, X 119; c, far posterior parapodium, 
X 119; d, acicular neuroseta from the same parapo¬ 
dium, X 652. 
