2 NEW SPECIES OF PHASCOLION (SIPUNCULA, PHASCOLIONIDAE) FROM TROPICALAND SUBTROPICAL WATERS OF THE CENTRAL-WESTERN ATLANTIC

Phascolion (Isomya) gerardi, a new species of Sipuncula, is described from littoral waters of the Bahamas, Belize, and the Yucatan coast of Mexico where it inhabits rubble associated with coral reefs. A new int erstitial species, Phascolion (Phascolion) psammophilum, is described from depths of 15-19 m off the coast of east central Florida. It is th e first sipunculan, documented as an adult rather than juvenile, to be reported as a member of the meiofaunal community. Observations on dev elopment, resulting from laboratory spawnings, reveal a typical lecith otrophic trochophore and a short-lived lecithotrophic pelagosphera lar va that transforms into a crawling juvenile at 4 days of age. Station data for these collections are presented in an appendix at the end of the paper.