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Records of the Australian Museum (2009) Vol. 61 
plates 4, peduncular wings unfringed. Number of radioles, 
presumably on each side, 25, arranged in a circle. In another 
specimen, the operculum and peduncle was 8.5 mm long, 
its operculum alone, 2.5 mm, and it consisted of 6 stacked 
plates; their number in all his specimens ranged from 3-7. 
Thoracic chaetigers numbered 7. Bayonet collar chaetae 
described as having a squarish boss; and thoracic uncini as 
having a dozen teeth. 
Monro (1936: 192) identifies the above material from 
“Discovery” Station 941 off New Zealand, as S. latiscapus 
(Marenzeller, 1885). It is, however, described as a new 
species, S. zelandicus in the present account. Although 
Monro does not describe its tube, the following data are 
provided with regard to the worm. A larger specimen is 
about 23 mm long, its width 3.0 mm; operculum consists of 
1 to 5 thin stacked calcareous plates; special collar chaetae 
described as “with a short wide striated fin-like process at 
the base of the narrow anterior blade” and the thoracic uncini 
as having about 12 teeth in addition to the basal gouge. 
Monro’s description of the bayonet collar chaetae as having 
a fin-like process at the base of the blade appears to be due 
to a misinterpretation of the chaetal structure. As shown in 
the present study of several species of Spirobranchus , the 
special collar chaetae could range from being bayonet-shaped 
and possessing a squarish basal boss, to those in which 
the boss is reduced to various extents and even in being 
completely absent, but a fin-like process does not occur in 
Spirobranchus. The part of the bayonet chaeta described by 
Monro as being fin-like is, therefore, the boss at the distal 
end of the chaetal shaft. The descriptive term “fin-like” is 
used for that fin-shaped part of the bayonet collar chaeta that 
is separated from the rest of the blade in certain other genera 
as, for example, Filograna Oken, 1815 among Serpulidae, 
and Spirorbis Daudin, 1800 among Spirorbidae ( vide Knight- 
Jones & Knight-Jones, 1977). 
Spirobranchus zelandicus differs from S. latiscapus 
(Marenzeller) in the following respects. The tube in the 
former is white to cream coloured, has a high, thick, wavy 
MLR, which projects conspicuously over the aperture, but 
lacks LLRs. In contrast, that in S. latiscapus, as described by 
Marenzeller (1885), is pinkish-red and has not only a MLR, 
but usually also LLRs, all usually bearing pointed processes 
or lamellae. Special collar chaetae of S. zelandicus possess 
a smoothly elongated non-squarish boss, whereas that of S. 
latiscapus is squarish. 
Etymology. Named after its type locality, New Zealand. 
Spirobranchus zibrowii n.sp. 
Fig. 63A-L 
Material examined. Syntypes: BMNH 1959.10.19.25-28 and BMNH 
1959.10.19.22/24, from Cronulla, New South Wales, Australia, collected 
and determined as Pomatostegus polytrema (Philippi) by B. Dew. Two 
vials containing several fragments and 10+ worms and detached opercula. 
According to a note by H. Zibrowius in 1973 with syntypes, it is a new 
species of Pomatoceros. AM W3578, a large cluster of tubes about 6.0 
cm in diameter, 25 specimens, Blackhead, Gerroa, New South Wales, 
Australia, 34°36'S 150°50’E, coll. E.C. Pope, 15 Sept. 1947; according 
to notes with collection: determined as Pomatoceros sp. by Dew; a new 
species by H. Zibrowius in 1973, and by H.A. ten Hove. AM W3635, 
1 specimen, and AM W5637, 12 specimens, all from Hungry Point, 
Cronulla, New South Wales. Australia, 34°04’30"S 151°08’48"E, collected 
by B. Dew, 6 Oct 1956. A note by H. Zibrowius states that this was to 
be described as a new species, Spirobranchus australis. AM W3917, 
1 specimen, Long Reef, west end of reef, 33°44’S 151°19'E, collected 
by D. Straughan, 27 Jan. 1964, and, according to notes with collection, 
determined by D. Straughan as Temporariapolytrema , but a new species by 
H. Zibrowius in 1972. AM W3918,2 specimens, Vincentia, Jervis Bay New 
South Wales, Australia, 35°04'30"S 151 o 41'0"E, coll, by D. Straughan, 26 
Jan. 1964, and, according to notes with collection, determined as Temporaria 
polytrema by D. Straughan, but considered a new species by H. Zibrowius 
in 1972. AM W23503,2 specimens + 3 empty tubes, Cronulla, New South 
Wales, Australia, 34°04'S 151°09'E, according to note with collection, 
determined by H.A. ten Hove as belonging to same species considered 
to be new by H. Zibrowius in 1972. AM W23500, 7 specimens, Bottle 
and Glass Rocks, Port Jackson, New South Wales, Australia, 33°50'54"S 
151°09'E, 1 Nov. 1955, according to note with collection, determined 
by ten Hove as belonging to a new species. AM W23502, 1 specimen, 
Cronulla, New South Wales, Australia, 34°04'S 151°09'E, 1 Nov 1955. 
AM W23501, 2 specimens, Hungry Point, Cronulla, New South Wales, 
Australia, 34°04'30"S 151 o 08'48"E, 15 Aug 1950, examined by ten Hove & 
labelled as the same new species as intended to be named by H. Zibrowius 
as Pomatoceros australis. 
Description 
T\ibe. In syntypes, colour white to faintly bluish, with faint 
to darker bluish-grey along flanks, much lighter or white 
along flanges. Triangular in cross-section with a wide flange 
on each side (Fig. 63A-D); MLR high, continuous, sinuous, 
and projects forward quite conspicuously over aperture; 
a very low LLR present on either side of MLR. A row of 
obliquely elongated to oval foramina present on either side 
of MLR, at its base; likewise, a row of foramina present on 
either side of each LLR, at its base (Fig. 63A,B); moreover, 
another row of foramina, present along each flank of the 
tube. Variations occur, (Fig. 63C,D), where the LLR may 
be reduced in places and only foramina may be irregularly 
present. Shallow, anterolaterally-directed grooves alternate 
with low ridges along the lateral flanges (Fig. 63A,B); flanges 
usually obliquely chambered (Fig. 63C). 
Worm. Syntypes poorly preserved, brittle, apparently having 
dried up and re-introduced into alcohol. Operculum is on left 
side, no rudimentary operculum on right; bears 2 to a few 
obliquely stacked plates; most distal plate may be considerably 
smaller in diameter than basal plate, and separated from rest 
by a short irregular cylindrical column (Fig. 63E-H). In a 
third specimen two plates present, including basal plate, 
eccentrically attached (Fig. 631,J); a translucent rim present 
on each terminal plate; a granular calcareous overlay seen 
when illuminated from certain angles (Fig. 63G-I). Peduncular 
wings apparently fringed in a specimen which shows 3 
papillate processes on one side (Fig. 63J). 
Chaetae. Bayonet collar chaetae do not possess a squarish 
boss; instead, it appears to be elongated, gradually sloping 
and merging with a slender tapering blade (Fig. 63K); in 
lateral view, about half-way from proximal end of blade, 
clear part of the latter considerably narrower than serrated 
area (Fig. 63K); distal part of chaetal shaft apparently 
unserrated; or, perhaps, indistinguishable from serrated 
blade; chaetae accompanying special collar chaetae of similar 
length but more slender (Fig. 63F). Thoracic, anterior and 
posterior abdominal uncini saw-shaped, bearing only about 
8 or 9 teeth, besides anterior gouged process; two sides of 
latter pointed. Abdominal neurochaetae with long shafts 
protruding conspicuously from beyond body wall present 
along almost entire length of abdomen, commencing from 
about 2 or 3 segments from anterior end; their flattened 
