POLYCHAETOUS ANNELIDS 



Part VI. Paraonidae, Magelonidae, Longosomidae, 



Ctenodrilidae, and Sabellariidae 



(Plates 27-42) 



By Olga Hartman 



The five families reported below are small, each known through com- 

 paratively few species or genera. All save the Sabellariidae are represented 

 by species rarely encountered even in large collections. The Paraonidae, 

 Magelonidae, and Longosomidae, new family, and perhaps also the 

 Ctenodrilidae have their affinities with the spioniform chaetopods. The 

 occurrence of each of these is of particular interest because their presence 

 has remained unknown from the areas where found. One species, Longo- 

 soma catalinensiSj new genus and species, is believed to represent a group 

 for which a new family name is proposed. Twenty-six species of the 

 Sabellariidae are discussed ; among them, four species and one subspecies 

 are believed to be new. 



The following station numbers of the Velero III are represented. 

 Those stations for which information has been given in previous reports 

 are merely listed ; the others are given with locality data. 



St. 10-33. Phragmatopoma attenuata, new species 

 St. 15-33. Phragmatopoma attenuata, new species 

 St. 28-33. Lygdamis nesiotes Chamberlin 

 St. 30-33. Osborn Bay, Osborn Island, Galapagos. 



Idanthyrsus pennatus (Peters) 

 St. 56-33. Flamingo Bay, Charles Island, Galapagos. 



Idanthyrsus pennatus (Peters) 

 St. 69-33. Idanthyrsus pennatus (Peters) 

 St. 80-33. Duncan Island, Galapagos. Shore. 



Idanthyrsus pennatus (Peters) 

 St. 94-33. Idanthyrsus pennatus (Peters) 

 St. lOla-33. Darwin Bay, Tower Island, Galapagos. Shore. 



Idanthyrsus pennatus (Peters) 

 St. 129-34. Idanthyrsus pennatus (Peters) 

 St. 229-34. Cobita Bay, Colombia. Shore. 



Phragmatopoma attenuata, new species 

 St. 239-34. Idanthyrsus pennatus (Peters) 

 St. 258-34. Puerto Culebra, Costa Rica. In coral clumps. 



Idanthyrsus pennatus (Peters) 



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