102 



T.G. PILLAI AND HA. TEN HOVE 



Fig. 34 Crucigera inconstans Straughan, 1967. A-M, From Sandy Beach, 21 km from Coff s Harbour. A, Right radioles of non-operculate 

 specimen with rudimentary, but developing, operculum. B, Ventral view of large specimen showing apron. C, A large non-operculate 

 individual with rudimentary opercula. D-M, Bayonet chaetae from the same fascicle of a large non-operculate specimen. 



percula and opercula while defining the genera Serpula, 

 Crucigera, Hydroides and Protohydroides. However, there 

 is some inconsistency in terminology since he explicitly 

 refers to the 'much reduced ventral most one pair of 

 branchiae', and branchiae are also referred to as 'filaments' 

 (= radioles). There is, therefore, room for doubt, and one 



might infer that his 'palpi' are located on the dorsal side, 

 and may actually be elongated rudimentary opercula. 



The condition of the thoracic membranes in P. pacifica is not 

 clear from the description. They sharply decrease in width 

 posteriorly from the 5th chaetiger onwards and are insignificant 

 or lacking as they approach the end of the thorax. 



