INTRODUCTION 



This paper is the sixth part of a work the intent of which is to 

 describe and illustrate the Foraminifera of the Atlantic Ocean, espe- 

 cially those species which have occurred in the waters adjacent to the 

 shores of the United States, including the whole of the Gulf of Mexico 

 and the Caribbean Sea, that being the area in which most of the work 

 of the vessels of the United States engaged in dredging work has been 

 done. This part includes the families MilioHdae, Ophthalmidiidae, 

 and Fischerinidae. For the most part these hve in shallow warm 

 waters and are not to be found so abundantly in the dredgings as in 

 shallow-water collections near shore. 



Joseph Augustine Cushman. 



