THE FORAMINIFERA OF THE ATLANTIC 



OCEAN. 



ASTRORHIZIDAE. 



By Joseph Augustine Cushman, 



Of the Boston Society of Natural History. 



GENERAL ACCOUNT. 



In a previous work on the Foraminifera of the North Pacific Ocean^ 

 the \vTiter has given a general account of the Foraminifera. For a 

 more lengthy and detailed account the reader is referred to Chapman's 

 volume on the Foraminifera, 1902. 



From the fact that much of the worlv on Recent Foraminifera has 

 been done by English and French workers the area about the British 

 Isles and the immediate coast of Em-ope is better known than any 

 other region. As a result the known foraminiferal fauna of the 

 eastern North Atlantic is very considerable. The work of Sars, 

 Goes, WiUiamson, Parker, Jones, H. B. Brady, Robertson, Siddall, 

 Chaster, Wright, Sidebottom, Heron- Allen, Earland, Pearcey, 

 D'Orbigny, Schlumberger, de Fohn, Schaudinn, Rhumbler, and 

 many others has made a formidable mass of literature on the recent 

 foraminifera of this region. From the western Atlantic Bailey, 

 Goes, and Flint especially have given us many records from the 

 American coast including the West Indies. 



From the deeper regions the Challenger expedition with those of 

 the Porcupine, Knight Errant, GoldseeTcer, Albatross, and many other 

 expeditions have added greatly to the mass of records from this 

 ocean basin. 



The Atlantic beuig shallower than the North Pacific has much 

 gi'eater deposits of globigerina ooze with comparatively small areas 

 of red clay. The great development of shallow water continental 

 shelf areas on the Atlantic coasts of Europe and America makes 

 prohfic areas for many species, while the coral reefs of the warmer 

 regions of the West Indies give a great development of tlie character- 

 istic species of such warm waters. 



Tluit there are rerj well developed areas of distribution is shown 

 by the records of the species of this single family. As a rule, the 



» BuUetin 71, U. S. Nat. Mns., 1910-1917. 



