Poly dor a from Eniwetok, Majuro, and Bikini — W oodwick 
151 
minuta Potts. There was no consistent relation- 
ship with any one species. (Information on 
related species was supplied by Dr. Donald J. 
Reish. ) 
Pseudo poly dor a corallicola n. sp. 
Fig. 2(9-12) 
A complete specimen had 36 segments; it 
was 5.0 mm long and less than 1.0 mm wide. 
Unlike most polydorids it is somewhat square 
in appearance from the 5 th segment anteriorly. 
The body is widest at the anterior end near the 
5th segment and is attenuated in the posterior 
third. 
The prostomium is damaged but its appear- 
ance suggests bifurcation (9). The caruncle ex- 
tends to the posterior end of Segment 6. A 
nuchal tentacle is present in the dorsal median 
line at the level of Segments 1 and 2. There is an 
anterior pair of eyes present and the usual 
posterior pair of eyes is represented by a single 
enlarged eye spot just to the right of the median 
line. Possibly the left member of the posterior 
pair has been displaced to the right and the two 
fused. 
Segment 1 is about half as wide as Segment 5. 
The neuropodium is displaced dorsally to a posi- 
tion comparable to that of the notopodia of 
segments posterior to Segment 2. The neurosetae 
project anteriorly. The notopodium is also dis- 
placed towards the median dorsal line near the 
caruncle. There are no notosetae and the post- 
setal lobes are more cirrate than lobate. 
In Segment 2 both the noto- and neuropodia 
are slightly displaced towards the dorsal midline. 
Setal lobes and setae are present in both the 
noto- and neuropodia. Notosetae include long 
dorsal capillaries and two rows of shorter setae, 
the most anterior of which are the shortest and 
have a heavy- winged shape; those of the pos- 
terior row, slightly winged but more capillary 
in nature, are widened in the distal portion. 
In Segments 3 and 4 the setal arrangement 
shows intergradations leading to the typical U- 
shaped double bundle of setae in Segment 5. 
Dorsal to these two rows are the well-developed 
groups of capillary setae. 
Segment 5 is the widest part of the body. As 
previously noted, the setal arrangement is a 
culmination of the pattern established in suc- 
cession through Segments 2-4. The anterior dor- 
sal capillaries are well developed and in general 
are instrumental in producing a homogeneity of 
appearance in the anterior segments — typical of 
Pseudopolydora but not of Polydora and Boc- 
cardia. The lower two rows of setae are turned 
back (the ventral-most setae are displaced to 
the posterior and then turned dorsally so that 
the original setae at the dorsal and ventral ex- 
tremities of a row are now the apical setae in 
the unjoined or dorsal part of the U-shape); 
as the two rows orient into the U-shape they 
produce an inner and an outer row of separate 
types of setae. The latter are spoon-shaped and, 
if unworn, the spoon has a sharp basal point. 
The inner row (posterior row) is made up of 
heavier stalked setae having an angled distal end 
terminating in a rounded tip (11). The latter 
are like the typical modified hooks or spines 
found in the fifth segment of Polydora and 
Boccardia species. There is a neuropod ial lobe 
with associated setae. 
Segments 6 and 7 contain large paired in- 
ternal glands in the same location as glands 
which the author has seen in stained-sectioned 
material of Polydora nuchalis Woodwick. In the 
latter species the stain reaction suggested a 
function related to mucous secretion for the 
glands. 
Segment 7 has full-sized branchiae, which are 
large in size on succeeding segments through 
Segment 13; they decrease in size posteriorly 
but are still present in Segment 21. 
Segment 8 has the first neuropodial hooded 
hooks, as is typical for members of the genus. 
The hooks are bidentate, with the larger tooth 
having about a 90° angle with the main setal 
shaft. The accessory tooth is smaller and closely 
applied to the main tooth. This relationship 
occurs in other Pseudopolydora, for example Ps. 
kempt Southern ( 1921 ) . An unusual feature of 
the hooded hooks is the fenestration of the ends 
of the teeth (10). 
The pygidium is 0.3 mm wide, flared in shape 
but not broadly, being no greater in diameter 
than the pre-pygidial segments. It has a definite 
dorsal notch and a less well-developed ventral 
notch (12). 
Bundles of posterior notopodial spines are 
found in the posterior third of the body. These 
