2. EXTERNAL MORPHOLOGY AND THE GENERAL BODY PLAN 



15 



Fig. 8. A female Siboglinum caulleryi. The tentacle and hind part of the body are omitted. 

 an - girdles; с - cephalic lobe; f- bridle; tns - mesosoma; tnts - metasoma; pa - papillae; 

 pan - postannular region of the metasoma; pran - preannular region of the metasoma; ps- proto- 

 soma; ram - nonmetameric part of the preannular region of the metasoma; rm - metameric part 

 of the preannular region of the metasoma; sc - dorsal shields; sv - ventral sulcus; t - tentacle; 

 v - postannular papillae; vd - dorsal blood vessel seen by transparency. 



