170 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.4 



Conditions everywhere seem to have provided opportunities for 

 variation in the Family Hydractinidae (mainly in the genus Hydrac- 

 tinia), where nine species out of ten in the family are described as new; 

 and these new species are equally distributed among the three divisions. 

 The Clavidae, the Tubularidae, and the Sj^nthecidae, with smaller num- 

 bers of species, show much the same situation, except that the Syn- 

 thecidae species were restricted to Divisions B and C. 



The Lafoeidae is rather partial to the Galapagos region, particularly 

 to the small area near North and South Seymour, Daphne Major and 

 Minor islands, where conditions evidently favored variation in this 

 family. 



Of the larger families, the Plumularidae has the largest represen- 

 tation as well as the largest number of new species, relatively and abso- 

 lutely. The most prolific small area, especially for the genera Aglao- 

 phenia and Ant ennui aria, is the Gulf of California. Not very far behind 

 is the Family Campanularidae, the only large family that has a greater 

 number of species in common with the Northeast Pacific than with the 

 North Atlantic. The Sertularidae and the Halecidae have not developed 

 so many new species. The Sertularidae, which is so well represented in 

 the Northeast Pacific, is saved from near elimination by the numerous 

 species of Sertularella and Sertiilaria. 



In the case of most of the species previously recorded, the records 

 are sufficient to mark out quite well the distribution route, but there are 

 some notable exceptions to this. For example, Streptocaulus pulcherrimus 

 Allman was originally reported from Cape de Verde Islands, and not 

 reported again until several specimens were obtained from the vicinity 

 of Hood and Barrington islands in the Galapagos. Endotkeciwn redupli- 

 catum Fraser, reported previously only from Sagami Bay, Japan, when 

 it was first described, was obtained from Bahia Honda and White 

 Friars. These are not the only species, however, found in common with 

 the Gulf Stream area or Equatorial Current, on the one hand, and in 

 Japanese waters, on the other. 



