INTRODUCTION. 



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



describe and illustrate the Foraminifera of the Atlantic Ocean, 



especially 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 Carribean 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 only the family Textula- 



riidae. The first part issued in 1918 included the family Astro- 



rhizidae, and the second part issued in 1920 included the family 



Lituolidae. 



Joseph Augustine Cushman. 



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