Pillai: Serpulid polychaetes from the Australian Kimberleys 
195 
12 Corona consists of usually 7, sometimes 6, processes, all of them 
devoid of basal spines; most dorsal process stout, elongated, and 
terminates in 3 sharply pointed hooks, one of the latter curved 
ventromedially and the other two posterolaterally; the remaining 
coronal processes simple, short, outwardly curved; infundibulum 
obtusely funnel-shaped, its radii end in simple, somewhat swollen 
to T-shaped processes . Hydroides minax (Grube, 1878) 
-Corona and infundibulum consist of other forms . 13 
13 Coronal processes, including the modified one, lack medial 
processes; marginal infundibular processes end in swollen 
to T-shaped tips; bayonet shaped collar chaetae possess a 
very long unserrated notch, about Vs length of blade, and 
the 2 teeth at base of blade way down along the boss, unlike 
in H. exaltatus . Hydroides pseudexaltatus n.sp. 
-Corona and infundibulum consist of other forms . 14 
14 Corona consists of 7 processes, of which the most dorsal one is 
vesicular, shaped like a swollen beak, curved towards centre of 
crown; remaining processes highly reduced, pressed against base 
of modified processes, their bases broad, and their short simple 
pointed tips directed outwards; infundibulum a short funnel, its 
radii pressed against the base of corona, their simple black tips 
directed outwards. Hydroides simplidentatus n.sp. 
-Corona and infundibulum consist of other forms . 15 
15 Corona consists of 6 or 7 similar tapering spines, firstly 
directed anteriorly and inclined towards the centre, then curved 
outwards before ending in outwardly curved black, pointed, 
tips. Each spine also bears a medial spine and a basal spine, 
which sharply curved towards the base, as well as a pair of 
outwardly directed spines. Infundibulum funnel shaped, each of 
its marginal processes has a sub-terminal knee-like bend beyond 
which it tapers and ends in a simple, pointed, outwardly curved 
process . Hydroides spiculitubus n.sp. 
-Corona and infundibulum consist of other forms . 16 
16 Corona consists of 9 processes, most dorsal of which is vesicular 
and anteroventrally directed, with a dorsolateral extension on 
either side, which gives it a T-shaped appearance in anterior 
view; remaining coronal spines simple, end distally in somewhat 
T-shaped tips. Infundibulum-funnel-shaped, its radii end distally in 
swollen to T-shaped tips . 
Hydroides spiratubus n.sp. 
17 
■ Corona consists of several, at least 11-15, processes, all outwardly 
directed and devoid of basal processes; most dorsal spine larger 
than rest, ends distally in a pair of dorsolaterally directed processes 
and a medial pointed beak-like swelling; tips of remaining 
coronal spines T-shaped, ends of latter pointed. Infundibulum, 
a short obtuse funnel, its radii end in T-shaped tips; ends of 
latter pointed . Hydroides trihamulatus n.sp. 
Operculum usually consists of a funnel-shaped infundibulum, bearing 
a number of radii separated by interradial grooves and ending 
in marginal lobes. Internal tube structures present .... Spiraserpula snellii Pillai & ten Hove, 1994 
■ Operculum usually consists of a funnel-shaped infundibulum, 
bearing a number of radii separated by interradial grooves and end¬ 
ing in marginal lobes. Internal tube structures absent .genus Serpula Linnaeus, 1758 . 18 
