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Records of the Australian Museum (2009) Vol. 61 
Figure 38. A-D, Spirobranchus cor- 
niculatus (Grube, 1862) from AM 
W202960: (A) complete specimen 
showing its single median longitu¬ 
dinal ridge, fine transverse ridges 
alternating with fine fine grooves on 
either side of it, and the worm showing 
its unfringed inter-radiolar membranes; 
(B-D) different views of the operculum 
showing the unfringed peduncular wings, 
oval opercular plate with a broader anterior 
end, and the opercular horns located posteriorly on it. 
baileybrockae is S. coronatus Straughan (1967). It has 
been described as possessing 8-10 main opercular horns. 
However, differences in their form distinguish it from 
the present species. While the opercular horns in S. 
baileybrockae and S. tetraceros are directed anteriorly (more 
or less perpendicularly to the opercular plate), those in S. 
coronatus are directed radially (more or less flattened along 
the plane of the opercular plate), and bear numerous lateral 
processes. While the 8 long spines in S. baileybrockae are not 
dichotomously branched, they are dichotomously branched 
in S. tetraceros and S. coronatus. Moreover, S. coronatus 
lacks the row of 3 or 4 pointed medial spines along each 
main spine, as well as the short dichotomously branched horn 
arising from the centre of the circle of main horns, which are 
characteristic of S. baileybrockae (Fig. 37C). Furthermore, 
inter-radiolar membranes are unfringed in S. baileybrockae , 
but fringed in S. coronatus and S. tetraceros. 
Etymology. Dedicated to Dr Julie H. Bailey-Brock 
who, besides her contributions to our knowledge 
of serpulimorph polychaetes, provided a good 
description of the present species in 1985 as variant 
forms of Spirobranchus tetraceros (Schmarda, 1861). 
Spirobranchus corniculatus (Grube, 1862) 
Figs 38A-D, 39A-J, 40A-C 
Serpula (Pomatoceros) comiculata Grube, 1862: 66, fig. 5. 
Pomatocerus bucephalus .—Morch (1863: 411, fig. 26), 
Quatrefages (1865: 520-521), as Vermilia bucephala 
(Morch, 1863). 
Spirobranchus giganteus .—Straughan, 1967: 245, fig. 14e. 
Spirobranchus giganteus corniculatus (Grube, 1862).—ten 
Hove (1970: 24); Imajima (1976: 136, fig. 9a-p). 
?Spirobranchus gaymardi (Quatrefages, 1866).—Fiege & 
ten Hove (1999: 355-364). 
Material examined. Kimberleys, Western Australia: 5 specimens, AM 
W202960, Condillac Island, 14°06'S 125°33'E, sand with scattered 
bommies, intertidal, 0 m, 16 Jul. 1988, st 54; 3 specimens, AM W202959, 
Condillac Island, 14°06’S 125°33E, sand with scattered bommies, intertidal, 
6 m, 16 Jul. 1988, st 54.1 very large specimen, AM W202958, Albert Island, 
14°31’S 124°55’E; 1 specimen, AM W202952, West side of Cassini Island, 
13°57'S 125°37'E, low tide, 18 Jul. 1988, st 59; 3 specimens, AM W21426, 
Condillac Island, 14°06'S 125°33E, sand with scattered bommies, intertidal, 
6 m, 16 Jul. 1988, st 54; all coll. P.A. Hutchings. 
Additional material examined. Hulule, Male Atoll, Maldives, BMNH 
1938.7.25.2, labelled Type, Spirobranchus giganteus var. turbinatus, J.S. 
Gardiner. 
