THE FORAMINIFERA OF THE TROPICAL PACIFIC 

 COLLECTIONS OF THE "ALBATROSS," 1899-1900 



Part 4. — Rotaliform Families and Planktonic Families » 



By Ruth Todd 



INTRODUCTION 



This paper is the fourth and final part of a work the intent of 

 which is to describe and illustrate the Foraminifera of the tropical 

 Pacific collected in 1899 and 1900 by the United States Bureau of 

 Fisheries steamer Albatross, together with certain other related ma- 

 terial from shallow water of the same region. 



The route of the expedition, shown in the first part of this work 

 (Cushman, 1932, fig. 1), extended southwest and south from San 

 Francisco to the Marquesas and Paumotu Islands, thence west through 

 the Society and Cook Islands and Tonga group to Fiji, then north- 

 ward across the Equator to the Marshalls, and finally west and 

 northwestward to the Marianas. Most of the samples were from 

 around the Paumotus. 



Only selected samples from the many taken by the expedition are 

 included in the present study. This final and fourth part includes the 

 same samples as those studied in the earlier three parts. A few 

 localities have discrepancies in spelling, such as "Port Lotten, Kersail," 

 for Port Lottin, Kusaie. 



Previous parts of this work were published between 1932 and 1942 

 (Cushman, 1932; 1933a; 1942) and dealt in systematic order with the 

 families Astrorhizidae to Trochamminidae (Part 1), Lagenidae to 

 Alveolinellidae (Part 2), and Heterohelicidae and Buliminidae 

 (Part 3). The present subdivision (Part 4) of the study includes all 

 the remaining groups that comprise the calcareous coiled genera and 

 the planktonics. 



The first three parts of this work were done by Joseph A. Cushman. 

 Before he died in 1949, he had completed the identification of most 

 of the species included in this fourth part. Many of the species were 



Publication authorized by the Director, U.S. Geological Survey. 



