300 



PART II. SYSTEMATIC ACCOUNT 



three girdles and lingulate toothed platelets with strongly developed anterior 

 teeth (this last point has been investigated in only the first two species). 



The most distinctive features of S. silone are the shape of the cephalic lobe 

 and protosoma and certain peculiarities of the tube. 



0.2 



мм 



^ —i-^i^L: 



кЛ 



E f-- sass| 











H 



Fig. LL133: Siboglinum silone: Tube: A -the, anterior unringed part; B-D - different variants 

 of the anterior part of the tube; E-H - succeeding parts of the tube. 



Material: 16 tubes with animals or parts of animals and 21 empty tubes. 



Localities: Vityaz' stations 4620 and 4328 (31st cruise): Indian Ocean, to 

 the west of the coast of southern India, and the Arabian Sea in the Gulf of 

 Aden off the coast of Somalia near Cape Guardafui (12°N 51°E). 



Depth: 1300 and 900 m.] 



