Pillai: Serpulid polychaetes from the Australian Kimberleys 
189 
Figure 63. A-J, Spirobranchus zibrowii n.sp.: BMNH 1959.10.19.25-28: From specimens collected from Cronulla, NSW Australia, 
identified as Pomatostegus polytrema (Philippi) and presented by B. Dew. (A, B) two lateral views of a tube; (C,D) two dorsal views 
of another tube; ( E,F) two views of operculum of a specimen; (G,H) two views of operculum of another specimen; (7,7) two views of 
operculum of a third specimen; ( K) special collar chaetae: its shaft lacks a distal serrated area and its boss appears to be elongated and 
merges gradually with a reduced blade; (L) a “capillary” chaeta found together with the special collar chaetae; it is slender compared to 
the latter, but otherwise si mi lar. 
trumpet-shaped ends have one side drawn out into a tapering 
spine. Abdominal uncinal tori: short and lateral. 
Remarks. It would be useful to include some notes on 
examination of additional material since the syntypes are 
not well preserved. AM W3578 consists of a large cluster 
of about 6.0 cm in diameter, with numerous intertwined 
mutually bonded tubes. They are mostly bluish-grey. Tube 
lengths in such clusters are difficult to determine. Ridges 
and foramina are as in those observed in the BMNH 
sample described above, but mostly lacking LLRs. while 
the associated foramina are very poorly developed or 
altogether missing along most of the tube. In one of the 
larger specimens, total length of worm is 26.8 mm; width 
