. Bulletin of the Natural History Museum Zoology. 78 PILLAI AND TEN HOVE Table 16 S. nudicrista sp. nov. Some data on two specimens from Curacao. Specimen 1 Specimen 2 Width of thorax mm mm Length of radioles mm mm Pinnule-free tips (,M) short short No. of radioles (L/R) 7/8 9/8 No. of thoracic chaetal tufts (L/R) 9/7 8/6 Thoracic membrane ends ?/? 4/4 Length of abdomen ? mm No. of abdominal segments ? about 60 paratype 1 showed a slightly concave to asymmetrical cross- sectional edge to the ventral ridge, and a few isolated teeth in the location of the do
. Bulletin of the Natural History Museum Zoology. 78 PILLAI AND TEN HOVE Table 16 S. nudicrista sp. nov. Some data on two specimens from Curacao. Specimen 1 Specimen 2 Width of thorax mm mm Length of radioles mm mm Pinnule-free tips (,M) short short No. of radioles (L/R) 7/8 9/8 No. of thoracic chaetal tufts (L/R) 9/7 8/6 Thoracic membrane ends ?/? 4/4 Length of abdomen ? mm No. of abdominal segments ? about 60 paratype 1 showed a slightly concave to asymmetrical cross- sectional edge to the ventral ridge, and a few isolated teeth in the location of the dorsal ridge, somewhat similar to the condition in S. paraypsilon. There is also some similarity in the collar chaetae. ETYMOLOGY, nudus (L) = unadorned; crista = crest, ridge. Habitat and distribution. S. nudicrista is a shallow water cryptic species inhabiting coral reefs. It has hitherto been collected from Bonaire and Curacao. Spiraserpula sp. () Material examined. Curasao (Neth. Ant.): Piscadera Baai, outer bay in front of CARMABI, muddy reef, many sand spots, about 40 m, from dead corals, legit Hove, , Stn. 2054B (3 empty tubes, and some abdominal fragments, ZMA V. Pol. 3883). Description. Tubes are white, circular in cross-section. An erect portion shows a granular overlay, and an encrusting sponge at its base (Fig. 18,A). ITS characteristic of this genus are present in the coiled parts, and consist of an unserrated dorsal ridge and a serrated ventral ridge. The dorsal ridge is transparent, somewhat high, and has a smooth, somewhat T-shaped edge; it is spiral, on a columella-shaped axis in the spiral proximal portions of the tube (Fig. 18, B,C). The available portions of the worms were inadequate to assign the material to any of the other Caribbean species or a new species. Spiraserpula vasseuri sp. nov. (, A-H;21, A-K; 3, J) Helmut Zibrowius requested (pers. comm.) that the material on which he based his preliminary description of the pre
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