Fig. 121. Siboglinum tenue: A - front end of a female in dorsal, and, В - in ventral view, and, 

 С - from the right side; D - region of the girdles; E - part of a girdle; /'-toothed platelet from 

 one side ; G - front part of the tube ; H - middle part of the tube ; / - hind part of the tube. 

 an - girdles ; с - cephalic lobe ; с i - glandular girdle ; со - dorsal ciliated band ; da - anterior group 

 of teeth; dp - posterior group of teeth;/- keel of the bridle; gt - pyriform glands seen by transpar- 

 ency through the integument; ms - mesosoma; mts - metasoma; pa - papillae; ps - protosoma; 

 s 4 - post-tentacular groove; t - tentacle. 



