Fig. Y133. Siboglinoides dibrachia : A - front end of the body from the ventral side; В, С - the 

 fore-part of the body in dorsal and in ventral view ; D - the anterior group of girdles ; E, F - the 

 posterior girdle from the right side and in dorsal view; G - part of a girdle; H - toothed platelet; 

 / - a postannular dorsal shield and papilla from the dorsal and, J, from the right side. 

 an - girdle; с - cephalic lobe; со - dorsal ciliated band; da - anterior teeth; dp - posterior teeth; 

 ds - dorsal glandular shield; ep - epidermis;/- bridle; g - mesosomal flask-shaped glands; gt- 

 metasomal pyriform glands; ms - mesosoma; mts - metasoma; pa - metameric papillae; par - 

 postannular region of the metasoma ; ppa - postannular ventral papilla; ps - protosoma; 5 1 - groove 

 between the protosoma and mesosoma; s 2 - groove between the mesosoma and metasoma; sv - 

 ventral sulcus; t - tentacle. (After Ivanov, 1961a.) 



