CONTENTS xv 



Page 



36. S. sumatrense sp. nov. Ivanov 312 



37. S. Zanzibar icum sp. nov. Ivanov 315 



38. S. sergeevi sp. nov. Ivanov 318 



39. S. lacteum sp. nov. E. С Southward 322 



2. Genus Siboglino'ides Ivanov, 1961 325 



1. S. dibrachia Ivanov 325 



2. Order THECANEPHRIA IVANOV, 1955 331 



I. Family Polybrachiidae Ivanov, 1952 333 



1. Genus Heptabrachia Ivanov, 1952 333 

 /. H. abyssicola Ivanov 335 



2. H. gracilis Ivanov 338 



3. H. subtilis Ivanov 342 



4. H. beringensis Ivanov 347 



5. H. talboti E. C. Southward 350 



6. H. celebensis E. C. Southward 354 



7. H. ctenophora Ivanov 357 



8. H. canadensis Ivanov 362 



2. Genus Cyclobrachia Ivanov, 1960 365 

 /. C. auricnlata Ivanov 367 



3. Genus Diplobrachia Ivanov, 1960 370 



1. D.japonica Ivanov 371 



2. D. belajevi Ivanov 376 



3. D. capillaris (E. C. Southward) 378 



4. D. southwardae sp. nov. Ivanov 381 



4. Genus Zenkevitchiana Ivanov 1957 388 

 /. Z. longissima Ivanov 388 



5. Genus Polybrachia Ivanov 393 

 /. P. anmdata Ivanov 394 



2. P. barbata Ivanov 398 



3. P. gorbunovi (Ivanov) 400 



6. Genus Galathealinnm Kirkegaard, 1956 403 

 /. G. bruuni Kirkegaard 404 



2. G. brachiosum Ivanov 407 



3. G. arcticum E. C. Southward 414 



