THE FOEAMINIFERA OF THE ATLANTIC OCEAN 



ROTALIIDAE, AMPHISTEGINIDAE, CALCARINIDAE, CYMBALO- 

 PORETTIDAE, GLOBOROTALIIDAE, ANOMALINIDAE, PLANORB- 

 ULINIDAE, RUPERTIIDAE AND HOMOTREMIDAE 



By Joseph Augustine Cushman 

 Of Sharon, Massachusetts 



INTRODUCTION 



This eighth and hist part of the work on the Athmtic Foraxninifera 

 deals with the RotaUidae, Aniphisteginidae, Calcarinidae, Cymbalo- 

 porettidae, Globorotaliidae, Anomahnidae, Planorbulinidae, Ruper- 

 tiidae, and Homotremidae. In order to complete the generic and 

 family diagnoses except of those families which are not found living, 

 the genera are included whether they have hving species in the Atlantic 

 or not. It is always possible that some of the groups now known only 

 from the Indo-Pacific m.ay be later found in the western tropical 

 Atlantic, although, as this region is becoming better known, the possi- 

 bility of numerous additions is less probable. 



There are many species included here which are either rare or 

 wanting in the collections made by the United States Bureau of 

 Fisheries steamer Albatross, but are found in the collections from 

 shallow water along the eastern coast of the United States or about 

 the West Indies. Numerous species of the Rotaliidae, Anomalinidae, 

 Planorbulinidae, etc., are found attached to seaweeds or eelgrass, and 

 are very abundant in comparatively shallow water. Such species are 

 often washed in on our shores in great quantities, and are to be found 

 on beaches. They are often left in lines on the beach by the receding 

 waves, and with shell fragments form white bands which may be 

 scooped up and extensive collections made. The shore sands of Dog's 

 Bay, Ireland, are classic examples of this sort of deposit. 



The differences between the two sides of the Atlantic are very 

 marked in these families, many of which have but few species in com- 

 mon in the shallow waters of the two areas. 



A number of the species now living off the southeastern coast of 

 the United States have alread}^ been described from the Late Tertiary 

 of the same general region. 



Papers now under way on collections from the east coast of South 

 America and from Bermuda will add supplementary data to the 



records included in this bulletin. 



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