(a) Siboglinum Jacteum 

 Fore-part of the body inside tube 



(b) Siboglinum lacteum 

 Region of the girdles inside tube 



(c) Siboglinum atlanticum 

 Coiled tentacle inside tube 



(d) Siboglinum inerme 

 Living larva 



Plate IV. Photographs of living Pogonophora. By courtesy of A. J. Southward. 



