SIBOGLINUM. VARIABILE 



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Fig. 122. Siboglinum variabik: A - front end of the body in ventral, and, В - in dorsal view; 

 С - region of thickened papillae in ventral view; D - region of the girdles in ventral view; E - part 

 of a girdle ; F - toothed platelet viewed obliquely from one side ; G - tube at the beginning of the 

 ringed region; H- middle part of tube; /-hind part of tube ; jf - tube near the hind end. 

 an - girdles; с - cephalic lobe; ci - 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 trans- 

 parency; ms - mesosoma; о - egg seen by transparency, lying in the oviduct; pa - papillae; 

 ps - protosoma ; s 1 - groove between the protosoma and the mesosoma ; s 2 - groove between the 

 mesosoma and the metasoma; sv - ventral sulcus; t - tentacle. 



