94 



T.G. PILLAI AND H.A. TEN HOVE 



Table 21 S. lineatuba (Straughan). Measurements and counts from 

 Split Solitary Island material. 



Specimen 



Total 



Width of 



Length of 



No. of 



Capillaries 



no. 



length 



thorax 



abdomen 



abdominal 



on 







(mm) 



(mm) 



segments 





1 



15.9 



0.6 



13.2 



89 



13 



2 



15.7 



0.6 



12.6 



85 



13 



3 



15.7 



0.5 



12.7 



81 



12 



4 



13.9 



0.5 



10.9 



58 



17 



5 



13.0 



0.5 



12.7 



81 



13 



6 



10.1 



0.5 



10.9 



58 



17 



7 



9.3 



0.5 



6.8 



78 



16 



8 



1.3 



0.5 



0.4 



45 



25 



Table 22 S. lineatuba (Straughan). Number of thoracic chaetal 

 tufts and extent of the thoracic membranes in specimens from 

 Split Solitary Island. 



1 



1 



1 



No. of specimens (18) 1 

 No. of thor. chaetal 

 tufts 10/10 10/910/8 9/9 9/8 8/8 8/7 7/7 



No. of specimens 



(15) 

 Thoracic membr. 



ends 



1 114 112 12 1 



7/5 6/4 5/5 5/4 5/3 4/4 4/3 4/2 3/3 3/2 



sharp, and the diameter of the distal end of the former varies 

 from 1/3 to 2/3 that of the base of the latter. 



The median lobe of the collar shows one or more anteriorly 

 directed processes in some specimens, none in others. Up to 8 

 bayonet chaetae have been counted in a collar fascicle. A pair 

 of ventral thoracic glands is present (Fig. 30, E). The number 

 of thoracic chaetal tufts on each side varies from 7-10, and 

 the thoracic membranes end on the 3rd to 6th chaetigers, as 

 shown in Table 22. 



The specimens from South Solitary Island and Norah Head 

 agree with the above description. 



Live material. No records. 



Habitat and distribution. The species occurs from the 

 tidal zone down to about 20 m. It was very abundant on a 

 ceiling of a small cave at a depth of 12-19 m, forming 

 aggregations of up to 35 mm thick, and superficially 

 resembles S. ypsilon from a similar habitat in the Cape Verde 

 Islands. It has hitherto been collected only from N.S.W. 



Straughan, 29.iii.1986, legit H. A. ten Hove and P. Hutch- 

 ings, Stn. 30 (HOLOTYPE, AM W20390). 



Type locality. Sydney, Long Reef (Australia). 



Description. 



tube: Pink, with whitish lateral attachment areas and very 

 fine transverse wrinkles. The median tube parts are of a paler 

 pink colour than the medio-lateral parts, in fresh material. A 

 fine granular overlay is present, which can be seen at certain 

 angles of illumination. The lateral borders of the tube are 

 glassy and transparent. Irregularly laid along the outer sur- 

 face of the tube, and more or less perpendicular to it, are 

 small semilunar to crescentic discs (Fig. 31, A-C,E). They are 

 very thin, pink, glassy and transparent, and their axes are at 

 various angles to the longitudinal axis of the tube. Some of 

 them are even attached to the substratum just outside the 

 tube (Fig. 31, B). The maximum external diameter of the tube 

 is 0.85 mm. 



ITS consist of a serrated ventral ridge along its concave 

 wall (Fig. 31, E), and a smooth dorsal ridge. In addition, pink 

 disks are found on the inside too, on either side of the 

 serrated ventral ridge (Figs. 31, D; 3, M). In some cases the 

 discs appear to be through and through the wall. The 

 mid-ventral longitudinal groove of the abdomen (Fig. 31, F) is 

 applied to the serrated ventral ridge. The worm appears to 

 have a remarkable ability to adjust its abdominal segments in 

 relation to these sharp discs within the tube. 

 worm: Although only one specimen is available, it is com- 

 plete (Fig. 31, F). Its total length is 7.7 mm, thoracic width 

 0.56 mm; the abdomen is 6.6 mm long and has about 56 

 segments, the last 20 with capillaries. There are 6 radioles and 

 a rudimentary operculum on each side. A cluster of blackish 

 prostomial ocelli is present at the base of the radioles on each 

 side. There are 8 pairs of thoracic chaetal tufts. Where the 

 thoracic membranes of the two sides end precisely is not clear 

 since the thorax is highly contracted (Fig. 31, F,G), but an 

 apron is absent. No thoracic glands were discernible. 



The number of bayonet chaetae, 6 in each collar fascicle, is 

 high in relation to the size of the worm. Their serrated blades 

 are moderately long, the unserrated notch is about 1/3 the 

 length of the blade, and there are only 2-4 teeth on the basal 

 boss (Fig.31,H-M). A few small accessory teeth may be 

 present. Thoracic and anterior abdominal uncini bear about 6 

 and 5 teeth, respectively, in a single row. 



Etymology, diskos (Gr.) = discus; pherein (Gr.) 

 carry. 



to 



Spiraserpula discifera sp. no v. 

 (Figs. 31, A-M;3,M) 



Material examined. 



New South Wales: Sydney, Long Reef, from undersides of 



rocks in and bottom of tidal pools, mats of Serpula rubens 



Live material. Animal is orange in colour, with transpar- 

 ent branchiae. 



Habitat and distribution. 5. discifera occurs intertidally 

 on rocks. It has hitherto been collected only from Sydney. 



Fig. 29 Spiraserpula lineatuba (Straughan, 1967). A-N, From topotypical material, Straughan's original collection, NSW. Long Reef, 

 AM4019, ZMA V. Pol. 3450. O, From NSW, Split Solitary Island. A & B, Two views of same coiled tube with an erect part ending in 

 peristome, with longitudinal colour bands in A. B & C, Same tube with posterior coils opened to show the dorsal ridge. D & F, Tube 

 fragments with serrated ventral ridge. E, Posterior tube fragment with unserrated dorsal ridge. G-K, Bayonet collar chaetae. L, Thoracic 

 uncini with more than one row of teeth posteriorly. M, Anterior abdominal uncini. N, Bundle of flat trumpet chaetae from same abdominal 

 segment. O, Aggregation of tubes showing serrated ventral ridges along concave walls, unserrated dorsal ridges along convex walls, and 

 accessory dorso-lateral ridges (bottom left). 



