A MONOGRAPH OF THE FORAMINIFERA OF 

 THE NORTH PACIFIC OCEAN. 



CHILOSTOMELLID-E, GLOBIGERINID.E, NUMMULIT1D.E. 



By Joseph Augustine Cushman, 



Of the Boston Society of Natural History. 



INTRODUCTION. 



This fourth part of the work on the North Pacific Foraminifera 

 deals with three comparatively small families. In the natural order 

 of sequence the family Nummulitida3 should follow the Rotalidee, but 

 it is here included so that the next part may be devoted entirely to 

 the Rotalidse and the final part to the Miliolidse. 



As these families have been long worked on and especially the 

 Globigerinidse are of world-wide distribution it has been unnecessary 

 to describe new species. Although the North Pacific as a whole is 

 an area of red clay owing to the great depth, nevertheless in many 

 parts it has immense deposits of typical Globigerina ooze, and these 

 with certain restrictions which will be noted are very similar to those 

 of the North Atlantic. 



The Nummulitidas are rather poorly represented in the material, 

 largely due to the fact that most of the North Pacific material which 

 has been at my disposal has come from deep water and for the most 

 part outside the Tropics. The Nummulitidae, especially the larger 

 forms, are characteristic of shallow tropical regions, especially abun- 

 dant about coral reefs. Such habitats occur about the Hawaiian 

 Islands and the Philippines, and here they are abundant, especially in 

 the latter archipelago, but unfortunately the material from this region 

 available for the present work is very limited. One interesting feature 

 is the occurrence of these tropical forms up to the southern coast of 

 Japan, where, as has already been several times noted, the southern 

 East Indian fauna seems to reach its northern limits in this region. 



Certain of the Globigerinidse have been illustrated by photographs 

 taken at the United States National Museum from mounted speci- 

 mens. While these are too small to give minute detail they show in 

 a general way the actual appearance of the specimens bettor than 

 drawings. 



