26. SIBOGLINUM MACROBRACHIUM 



271 



Fig. В 133. Siboglinum macrobrachium: А, В - anterior end of animal, ventral and dorsal views; 

 C, D, E, F,G - anterior and middle parts, and three variations of the posterior part of the tube ; 

 H - part of tentacle ; J - diagrammatic transverse section of tentacle and pinnules ; К - first and 

 second girdles; L - third girdle; M - spermatophore. (After Southward, 1961b.) 



The following description is transcribed from Southward (1961b), by kind 

 permission of the author and the publisher, E. J. Brill. Paragraphs and 

 sentences have been transposed to bring the description into the form adopted 

 here. 



"The animals are up to 48 mm long with a tentacle 6-8 mm long, which is 

 usually coiled into a spiral. The tentacle is rather thick, its diameter being 

 about half that of the tube at the proximal end. It becomes a little thinner 



