NEMEKTEANS OF HAWAIIAN ISLANDS. 
981 
The walls of the stomach are without lobes except near its posterior end, where lateral pouches 
make their appearance. The most anterior of these pouches are but little developed, but they gradually 
become deeper at the approach to the intestine proper. The histological structures, too, gradually 
assume the characteristics peculiar to the intestine, so that there is no sharp line of demarcation 
between stomach and intestine proper. Similar conditions have been described for a number of 
Heteronemerteans. 
Nephridia. — The nephridial tubules are small and inconspicuous. They are situated, as in most 
related species, on the lateral borders of the posterior portion of the esophagus and beside the anterior 
portion of the stomach. There are numerous efferent ducts of minute size which pass immediately 
dorsal to the lateral nerves and open on the dorso-lateral surface of the body. About 8 efferent ducts 
could be distinguished on each side, although there may have been more, for their exact number was 
difficult to determine in the specimen sectioned because some of the ducts were so very inconspicuous 
j as to be hardly distinguished from radial bundles of connective tissue fibers which pass at irregular 
intervals through the body walls, particularly in the vicinity of the lateral nerves. 
Blood vascular system. — This presents few deviations from the arrangement of vessels found in 
related species. The cephalic lacunae, however, are smaller than in most other forms of the genus. 
Nervous system as in related species. Cerebral sense organs remarkably voluminous, with a large 
glandular lobe situated ventrally to the main body of each of the sense organs. 
Reproductive organs. — Sexual products immature in a specimen collected in April. 
Habitat. — Of the four specimens of this species col- 
lected by the Albatross, two were dredged at station 
3855, south coast of Molokai, at a depth of 127 to 130 
fathoms. The bottom here was composed of fine brown 
sand and gravel; bottom temperature, 65.5° F. The 
other two came from station 4079, north coast of Maui 
Island; depth, 143 to 178 fathoms; bottom composed of 
gray sand and foraminifera; bottom temperature, 60.8° F. 
The species may therefore be looked upon as in- 
habiting depths of over 100 fathoms, and this fact will 
partially account for the absence of eyes. 
Taeniosoma cingulatum sp. nov. 
(PI. 1, figs. 4-6; text cuts 3-7.) 
Body long and slender, rounded throughout (pi. 1, 
fig. 4); head rather slender, with a distinct annular 
groove situated immediately in front of mouth and sep- 
arating head from succeeding portions of the body; a 
less distinct groove lies farther forward on the head and 
marks off the snout from the posterior portion of the 
head (fig. 3; pi. 1, fig. 6). Esophageal region somewhat 
wider than intestinal region, into which it passes with- 
out external line of demarcation. 
Size. — Length of two preserved specimens (pi. 1, 
figs. 4, 5), 90 and 250 mm.; width, 3 mm. in esophageal 
region and 2 mm. in more posterior portions of the body. 
The two specimens were probably of about equal size in 
life, the great difference in their lengths after preservation being largely or wholly due to the different 
states of contraction. 
Ocelli.— Numerous conspicuous black ocelli of moderate size are situated on each lateral margin of 
the head (fig. 3). The number of such ocelli is from 35 to 50 on each side in each of the two specimens 
at hand. They extend in an elongated irregular cluster from near the proboscis pore along the lateral 
margins of the head backward nearly to the annular constriction separating head from body. About 
8 of these ocelli are situated in a single marginal row on the snout itself, the others scattered irregularly 
on the main portion of the head. All are crescentic or cup shaped, with the concavity directed 
laterally. 
Fig. 3. — Tsmiosoma cingulatum sp. nov. Outline of 
anterior portion of body of preserved specimen, 
showing position and arrangement of ocelli, the 
transverse groove separating snout from remain- 
ing portions of head, and the similar groove sepi 
arating head from esophageal region, x 23. 
