SIBOGLINUM WEBERI 



183 



the bridle (Fig. %E). The bridle itself is difficult to see in many specimens: 

 there is no ridge, only very thin, colourless keels, which fuse in a smooth 

 curve on the ventral side and approach one another fairly closely, without 

 joining, on the dorsal side (Fig. %D, E). Just behind the bridle there is a 

 small, ventral patch of glandular epidermis (Fig. 96£), which is not visible in 

 all specimens. 



"The groove between the mesosoma and the metasoma is shallow ventrally 

 but deep dorsally and the dorsal side of the mesosoma often projects back- 

 wards, as shown in Fig. %G. The first 2 mm of the trunk bears 24 to 45 pairs 

 of small papillae, with a rather shallow ventral sulcus between the two rows. 



A ШШ 



& 



s^sa 



?va 



0.2 

 мм 



H 



[фООООООВ 



« 



0.05mm , 



Fig. 96. Siboglinum weberi: А, В, С ~ anterior, middle and posterior parts of tube; D, E - 

 anterior end of animal, dorsal and ventral views; f-part of tentacle; G - junction of mesosoma 

 and metasoma, side view; H - first girdle; J - second girdle; AT -toothed platelets, side view; 

 L - cuticular bar from a postannular papilla; M- shape of spermatophore. Heavy stipple shows the 

 position of epidermal glands. (After Southward, 1961.) 



