SIBOGLINUM CINCTUTUM 



207 



whiteness of the rings of the tube 

 links S. vinculatum with S. cinc- 

 tutum and with S. frenigerum. 



Material : two specimens in 

 tubes, a mature male and a young 

 female. 



Locality : the Tasman Sea to 

 the west of New Zealand. 



Depth: 1925 and 1740 m. 



8. Siboglinum cinctutum Ivanov 

 (Figs. 108-9) 



Ivanov, 1957a: 446-9, 458, 459,490, 

 491, 496, 497, Figs. 14-16, 59; Ivanov, 

 1950a: 1541; Ivanov, 1960c: 5, 14, 27, 

 96, 127, 145, 148-51, 160, 264, Figs. 87, 

 108, 109. 



Only two specimens of this 

 species are known. The fore-part 

 of the body is comparatively short, 

 only about four and a half times as 

 long as broad (Fig. 108Л, B). The 

 boundary between the protosoma 

 and the mesosoma is a simple 

 transverse groove, and the meso- 

 soma is twice as long as the proto- 

 soma, which is not separated 

 from the equilateral triangle of 

 the cephalic lobe. The slender 

 tentacle was broken across in 

 both specimens and the distal part 



Fig. 108. Siboglinum cinctutum: A - front 

 part of the body of a female in ventral view; 

 В - the same from the dorsal side ; С - the 

 tube. 



с - cephalic lobe; ci - glandular girdle; со - 

 dorsal ciliated band;/- keels of the bridle; 

 ms - mesosoma ; mts - metasoma ; pa - pa- 

 pillae; pi - pinnules; ps - protosoma; s 1 - 

 groove between the protosoma and the 

 mesosoma; s 2 - groove between the meso- 

 soma and the metasoma ; sv - ventral sulcus ; 

 / - tentacle. (After Ivanov, 1957a.) 



