276 



PART II. SYSTEMATIC ACCOUNT 



colourless interspaces it is swollen to twice the normal thickness (Fig. 

 DU3B). 



"S. timorense is named after the nearest island ... It is very similar to 

 S.japonicum Ivanov, which was described from three incomplete specimens. 

 They are separated by a few rather minor differences, which are : the absence 

 of transverse fibres in the tube of S. timorense, together with slight differences 



0.5 a 



Fig. D133. Siboglinum timorense: A - anterior end of animal, latero-ventral view; В - middle part 

 of tube ; С - latero-dorsal view of bridle ; D - part of tentacle. Heavy stipple shows the position of 

 epidermal glands. (After Southward, 1961b.) 



in the appearance of the tubes, and an apparent difference in the disposition 

 of the pinnules on the tentacle. The wide band of pinnules in S. timorense 

 may have been produced from a narrower band, by contraction of the tentacle. 

 The thickness of the tube wall and its enlargement between the rings is very 



