@article {493,
	title = {Ultrastructural evidence for the contractile vessel of sipunculans as a possible ultrafiltration site},
	journal = {American Zoologist},
	volume = {27},
	year = {1987},
	note = {@ CONT. VESS. IS POST. EXTENSION OF TENTACULAR CANALS INTO THE TRUNK COELOM. THIS SYSTEM CONTAINS HEMOCYTES \& CONSIDERED TO BE A VASCULAR SYSTEM ANALOGUE. THE CV WALL HAS COELOMIC EPITHEL ON EACH SIDE WITH AN ECM BETWEEN. CIRC. \& LONGI MUSC. ARE SCATTERED WITHIN THE ECM. THE CV EPITHEL FACING THE TRUNK COELOM IS COMPOSED OF PODOCYTES. THE FUNCTIONAL ROLE OF THIS ARRANGEMENT MAY BE AS A FILTRATION SURFACE IN THE FORMATION OF A PRIMARY ULTRAFILTRATE. INCREASED HYDROSTATIC PRESSURE IN THE CV AS THE TENTS \& HEAD ARE RETRACTED COULD DRIVE FLUIDS THRU THE CV WALL TO THE TRUNK COEL. MODIFICATION TO SECONDARY FILTRATE COULD OCCUR IN THE METANEPH. THE ULTRASTRUCTURAL OBSERVATIONS SUPPORT THE HYPOTHESIS OF RUPPERT \& SMITH, *ABST. OF TALK ONLY* NOTE SAYS HE{\textquoteright}LL SEND ME REPRINT WHEN THIS GETS DEVELOPED \& PUBLISHED IN FULL.},
	pages = {810a},
	keywords = {CONTRACTILE VESSEL},
	author = {Pilger, J. F. and Rice, M. E.}
}
