A MONOGRAPH OF THE FORAMINIFERA OF 

 THE NORTH PACIFIC OCEAN. 



LAGENIDJS. 



By Joseph Augustine Cushman, 



Of the Boston Society of Natural History. 



INTRODUCTION. 



This third part of the work on the North Pacific Foraminifera deals 

 entirely with the Lagenidae, a family following in natural sequence 

 those families already considered in the two earlier parts. The same 

 arrangement of data is here adopted. 



The treatment of the Lagenidae will be found perhaps more con- 

 servative than that adopted in the earlier parts. This is due mainly 

 to the much greater amount of work that has been done on this family 

 by students of the Foraminifera. The Lagenidse have seemingly 

 always been a favorite with workers on the group, and the amount of 

 literature is far greater than that on the families thus far considered. 



There have been a number of works treating of the genus Lagena 

 alone, and it has therefore been unnecessary to describe any great 

 number of new species. The recent publication of Mr. Sidebottom on 

 Lagena 1 has been of great assistance. 



With the working out of the distribution of various species the 

 faunal areas of the North Pacific have become more clearly defined. 

 The number of species found at some stations of the United States 

 Bureau of Fisheries steamer Albatross, off southern Japan, which are 

 recorded by Brady from off the Philippines, is very considerable. 



In addition to determining restrictions of range it has been possible 

 to greatly extend the known range of certain species. 



In this part, in addition to the data given in the other parts, the 

 bottom temperature record of the station has been given in many 

 cases. With certain species this seems to have a definite bearing on 

 the distribution. 



» Journ. Quekett Hicr. Club, vol. 11, 1912. 



