New species of genus Phascolion

Three new species of sipunculans collected during the expeditions of 1958—1962 in the Indian Ocean and South Atlantic are described. Phascolion indicus sp. n. Hooks absent; trunk lacks the attachment papillae with holdfasts; one retractor muscle originates ‘by two roots; intestine consists of some coils; rectum is attached to introvert completely; anus placed near the mouth. Ph. sandvichi sp. n. Hooks absent; there are attachment papillae with holdfast; contractile vessel is simple; intestinal spiral consists of 10 coils; the width of the dorsal retractor is 1.5 that of ventral one. Ph. ushakovi sp. n. Tentacular crown consists of about 20 tentacles; there are large hooks 0.25 mm in height; thick dorsal retractor arises in posterior part of the trunk at the same level as the ventral retractor; contractile vessel has some small prominences