Fig. 16. Spirobrackia beklemischevi - a female in ventral view. The hind part of the body is omitted. 

 an - girdles;/- bridle; mts - metasoma; pa - metameric papillae; pa 1 - non-metameric papillae; 

 ра г - median papilla, lying behind the girdles; pan - postannular region of the metasoma; 

 ps + ms - the fore-part of the body formed by fusion of the protosoma with the mesosoma; 

 ram - non-metameric part of the preannular region of the metasoma ; ra - ventral transverse row 

 of papillae; rm - metameric part of the preannular region sv - ventral sulcus; tc - tentacular 

 crown; te- outermost tentacle. (After Ivanov, 1957a.) 



