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Records of the Australian Museum (2009) Vol. 61 
Figure 19. A-E, Hydroides spiculitubus n.sp. from AM W21443. (A) two tubes partly attached to each other; ( B,C ) magnified anterior 
ends of latter; ( D ) worm, in part of its tube: note non-calcareous inner tube consisting of closely adposed spicules, part of the detached 
inner tube folded over the posterior end of abdomen, the granular overlay along longitudinal ridges and the fine transverse ridges and 
grooves; ( E ) enlarged view of four spicules from inner tube. 
curved, medial spine a little beyond them, and a basal 
spine. However, differences between them, following re¬ 
examination of the type specimen of H. tambalagamensis, 
BMNH 1960.3.13.30, are as follows. The coronal spines of 
H. spiculitubus are comparatively slender, directed anteriorly 
and meet sub-terminally, before curving outwards. In 
comparison, those of H. tambalagamensis are stout at their 
bases, rapidly tapering, directed outwards, and do not meet 
sub-terminally {vide Pillai, 1961: fig. 12A,B). The pair of 
spines in H. spiculitubus are external (Fig. 21A-C), whereas 
they are lateral in H. tambalagamensis, one on either side 
of each coronal spine (Pillai, 1961: fig. 12A,B). The medial 
spine of each coronal spine in H. spiculitubus is sharply 
hooked towards the centre of the coronal spines (Fig. 21D,E), 
in Imajima’s Southwest Japan specimens (Imajima, 1976: fig. 
2b) and in Chen & Wu’s specimens form China (2000: fig. 
6K). On the other hand, it is directed almost at right angles 
to each main spine in H. tambalagamensis is (Pillai, 1961: 
