SPIROBRACHIA BEKLEMISCHEVI 



455 



lophophore. Important distinctions from 5. grandis appear also to be the 

 absence of dorsal fusion of the keels of the bridle, the smaller plaques, 

 the shape and size of the spermatophores, and the considerably smaller 

 body size. 



Material : many tubes, mostly containing animals. 



Locality: Kuril Trench. 



Depth: 9000-9050 m. 



*- A 



Fig. 176. Spirobrachia beklemischevi: Tube: A - front end; В - middle; С - hind part. (After 

 Ivanov, 1957a.) 



Table 7 

 Characteristics of the species of Spirobrachia 



S. beklemischevi 



S. grandis 



Number of tentacles 



Length of tentacular crown (mm) 



Number of turns of spire of tentacular plate 



Number of turns of lophophore 



Length of fore-part (mm) 



Breadth of fore-part (mm) 



Dorsal fusion of keels 



Ventral meeting of keels 



Length of metameric region (mm) 



Number of pairs of metameric papillae 



Diameter of plaques of metameric region (/i) 



Size of spermatophore (mm) 



Maximum diameter of tube (mm) 



