150 
PACIFIC SCIENCE, Vol. XVIII, April 1964 
the caruncie. The median nuchal tentacle is 
located at the level of Segment 1. There are 
two pairs of eye spots; the anterior eyes are 
about twice the size of and are farther apart 
than the posterior pair. On preservation the 
specimens failed to retain their palps. 
In Segment 1 the notopodia and neuropodia 
are present but not well developed; the former 
are located in a more dorsal median position 
than the notopodia of other segments. There 
are no notosetae. 
Segments 2, 3, and 4 have well-developed 
post-setal lobes with two rows of numerous 
setae. 
Segment 5 from a dorsal view is distinguisha- 
ble from the preceding and succeeding segments, 
but it is less modified in this form than in mem- 
bers of the genera Polydora and Boccardia. The 
fifth segment is slightly larger than the other 
segments. It has reduced notopodial and neuro- 
podial lobes. The setae are oriented in two U- 
shaped or horseshoe-shaped rows, as is typical 
for the genus. The setae of the fifth have a 
second tooth (8) not figured by other workers 
( 7 ) ; if it is a special characteristic for the 
Marshall Island forms it seems not significant 
enough to suggest further taxonomic breakdown. 
Segment 7 has the first and a fully-developed 
pair of branchiae. A complete specimen of 46 
segments had 6 abranchiate, 25 branchiate, and 
15 abranchiate segments in that succession; a 
complete specimen of 66 segments had numbers 
of 6, 24, and 36, respectively. The last branchiae 
are less developed than the largest on the speci- 
men but they are not reduced to small papillae. 
Segment 8 has the first neuropodial hooded 
hooks. They are bidentate and typical for the 
group. 
The pygidium is cuplike, having a heavy cuff 
with dorsal and ventral clefts. It is larger in 
diameter than the posterior -most body segments. 
It is opaque, somewhat refractile, with a general 
whitish coloration. 
Calcareous particles were found in the gut of 
many of the worms. Their tubes were heavy- 
walled, formed of mucus and coral-like material. 
One specimen from Uliga (Majuro) was ex- 
panded dorsally in each segment from 13 
through 26; the material within was a pale pink- 
orange in color and is suggested to be repro- 
ductive in nature. 
Table 2 provides a comparison of Pseudopoly- 
dor a antennata as described by several workers. 
In most characteristics the forms described are 
alike. The table emphasizes the areas of differ- 
ence. 
P. antennata was collected at Eniwetok on the 
islands of Eniwetok and Parry (11 stations). It 
was also taken at Uliga of Majuro Atoll. This 
species was found on both the ocean and lagoon 
sides but, unlike most of the forms in this col- 
lection, its habitat is mud, sandy mud, and 
coarse sand. It is able to survive in polluted 
areas for it was present in black odoriferous mud 
5 ft from a sewer outfall on Parry. Claparede 
(1870) described it from galleries of wood 
inhabited by Teredo (ship worm). Okuda (1937) 
collected it from a muddy substratum between 
crevices of shore rock. 
Associated polychaetes at separate stations 
included Opisthosyllis brunnea Langerhans, Lys- 
idice collaris Grube, and Me so chaetopterus 
TABLE 2 
Comparison of Characteristics of Pseudopolydora antennata 
CHARACTERISTICS 
FAUVEL (1927) 
ENIWETOK 
OKUDA (1937) 
FAUVEL (1932) 
extension of caruncle 
to 2nd or 3rd 
ant. 5th to 
post 6th 
post 6th 
not stated 
branchiae 
begin 7th 
to 40-50th 
begin 7th 
—to 32 (46) 
— to 3 1 ( 66 ) 
begin 7th 
— -to 90- 
100th (104) 
begin 7th 
not stated 
size 
20-30 mm 
65-100 segm. 
17 mm 
74 segm. 
30 mm 
104 segm. 
20-30 mm 
second tooth, setae of 5th 
not indicated 
present 
not indicated 
not indicated 
