TUBE-BUILDING AND FEEDING IN THE CHAETOPTERID POLYCHAETE, SPIOCHAETOPTERUS OCULATUS

摘要: 1.Spiochaetopterus oculatus secretes a small, cornified, annulated tube, approximately 0.75 mm. in diameter and eight or more centimeters length. The tube is constructed vertically intertidal subtidal sand mud with only few millimeters of the upper end projecting above surface substratum.2. secreted by epidermal glands occupying almost entire convex ventral anterior body region.3. One vertical half-cylinder at time, length cylinder corresponding to section between annulations. wall gradually thickened additional secretions.4. Temporary, transverse, button-like partitions are lower part tube. perforated several openings.5. An new region may be as branch old then sealed off.6. In constructing such branch, cut open one pair greatly...