Note
A laboratory study was conducted on the larval development, metamorphosis, and settlement behavior of Sabellaria floridensis from Florida, with additional observations on the development of Phragmatopoma californica from California. Metamorphosis of S. floridensis larvae occurred 18 to 27 days from fertilization with many larvae metamorphosing in the absence of sand grains or other substrate. Metamorphosis was followed by a crawling or exploratory period ranging from several hours to several days before larvae constructed tubes and began a sedentary existence. The significance of this unusual behavior is discussed and compared to that of other sabellariids.