SIBOGLINUM HYPERBOREUM 



237 



Fig. 120. Siboglinum hyperboreum: A - front end of a female in ventral, and, В - in dorsal view, 

 and, С - from the right side; D - part of a keel of the bridle under high magnification; E - region 

 of the girdles in ventral, and, F - in dorsal view; G - part of a girdle (on two platelets the bases of 

 the teeth are indicated) ; H - spermatophore (filament omitted) ; I- tube (transitional region between 

 the filmy part and the ringed part); jf- tube, about halfway along; AT- tube near the hind end. 

 an - girdles; со - dorsal ciliated band; da - front group of teeth; dp - hind group of teeth;/- keel 

 of the bridle ; p - cuticular plaque ; pa - papillae ; ps - protosoma ; s 1 - groove between the protosoma 

 and the mesosoma ; s* - post-tentacular groove ; sv - ventral sulcus ; t - tentacle. 



J 4 



