SIBOGLINUM NORVEGICUM 



253 



The female has the following dimensions : length of the tentacle, 1 1 mm ; 

 length of the fore-part of the body, 1 42 mm, of which the protosoma accounts 

 for 0-6 mm and the mesosoma for 0-82 mm; breadth of the mesosoma, 0-2 

 mm; length of the trunk, c. 37 mm. The fore-part of the body of the male is 

 the same size and of almost the same proportions. 



5— , 



Fig. 126. Siboglinam norvegicum: A - front end of a female in ventral, and, В - in dorsal view; 

 С - ventral view of the region of the bridle under higher magnification ; D - region of the girdles 

 from the ventral side ; E - part of a girdle ; F - toothed platelet (only the bases of the teeth are 

 indicated); G - front part of tube; H - middle part of tube. 



an - girdles; с - cephalic lobe; ci - glandular girdle; со - dorsal ciliated band; da - front group of 

 teeth; dp - hind group of teeth; f- keel of the bridle; tns - mesosoma; mts - metasoma; 

 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. 



